Fix sparse warning: Using plain integer as NULL pointer

This patch fixes the "using plain integer as NULL pointer" warnings
generated by running sparse on the flashrom source.

Corresponding to flashrom svn r1255.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Acked-by: Mathias Krause <mathias.krause@secunet.com>
Acked-by: Stefan Reinauer <stepan@coreboot.org>
diff --git a/cbtable.c b/cbtable.c
index dbb2cff..f30a3ae 100644
--- a/cbtable.c
+++ b/cbtable.c
@@ -141,7 +141,7 @@
 
 	};
 
-	return 0;
+	return NULL;
 }
 
 static void find_mainboard(struct lb_record *ptr, unsigned long addr)
diff --git a/chipset_enable.c b/chipset_enable.c
index 6d6008e..0896bce 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -1173,7 +1173,7 @@
 
 int chipset_flash_enable(void)
 {
-	struct pci_dev *dev = 0;
+	struct pci_dev *dev = NULL;
 	int ret = -2;		/* Nothing! */
 	int i;
 
diff --git a/cli_classic.c b/cli_classic.c
index 1211989..88b70db 100644
--- a/cli_classic.c
+++ b/cli_classic.c
@@ -116,23 +116,23 @@
 
 	static const char optstring[] = "r:Rw:v:nVEfc:m:l:i:p:Lzh";
 	static const struct option long_options[] = {
-		{"read", 1, 0, 'r'},
-		{"write", 1, 0, 'w'},
-		{"erase", 0, 0, 'E'},
-		{"verify", 1, 0, 'v'},
-		{"noverify", 0, 0, 'n'},
-		{"chip", 1, 0, 'c'},
-		{"mainboard", 1, 0, 'm'},
-		{"verbose", 0, 0, 'V'},
-		{"force", 0, 0, 'f'},
-		{"layout", 1, 0, 'l'},
-		{"image", 1, 0, 'i'},
-		{"list-supported", 0, 0, 'L'},
-		{"list-supported-wiki", 0, 0, 'z'},
-		{"programmer", 1, 0, 'p'},
-		{"help", 0, 0, 'h'},
-		{"version", 0, 0, 'R'},
-		{0, 0, 0, 0}
+		{"read", 1, NULL, 'r'},
+		{"write", 1, NULL, 'w'},
+		{"erase", 0, NULL, 'E'},
+		{"verify", 1, NULL, 'v'},
+		{"noverify", 0, NULL, 'n'},
+		{"chip", 1, NULL, 'c'},
+		{"mainboard", 1, NULL, 'm'},
+		{"verbose", 0, NULL, 'V'},
+		{"force", 0, NULL, 'f'},
+		{"layout", 1, NULL, 'l'},
+		{"image", 1, NULL, 'i'},
+		{"list-supported", 0, NULL, 'L'},
+		{"list-supported-wiki", 0, NULL, 'z'},
+		{"programmer", 1, NULL, 'p'},
+		{"help", 0, NULL, 'h'},
+		{"version", 0, NULL, 'R'},
+		{NULL, 0, NULL, 0}
 	};
 
 	char *filename = NULL;
diff --git a/physmap.c b/physmap.c
index 4641e8e..70156a6 100644
--- a/physmap.c
+++ b/physmap.c
@@ -180,7 +180,7 @@
 		}
 	}
 
-	virt_addr = mmap(0, len, PROT_WRITE | PROT_READ, MAP_SHARED,
+	virt_addr = mmap(NULL, len, PROT_WRITE | PROT_READ, MAP_SHARED,
 			 fd_mem, (off_t)phys_addr);
 	return MAP_FAILED == virt_addr ? ERROR_PTR : virt_addr;
 }
@@ -200,7 +200,7 @@
 		}
 	}
 
-	virt_addr = mmap(0, len, PROT_READ, MAP_SHARED,
+	virt_addr = mmap(NULL, len, PROT_READ, MAP_SHARED,
 			 fd_mem_cached, (off_t)phys_addr);
 	return MAP_FAILED == virt_addr ? ERROR_PTR : virt_addr;
 }
diff --git a/programmer.c b/programmer.c
index 0160867..5c1f963 100644
--- a/programmer.c
+++ b/programmer.c
@@ -30,7 +30,7 @@
 void *fallback_map(const char *descr, unsigned long phys_addr, size_t len)
 {
 	/* FIXME: Should return phys_addr. */
-	return 0;
+	return NULL;
 }
 
 /* No-op/fallback unmap() for programmers which don't need special handling */
diff --git a/serprog.c b/serprog.c
index 2cdfea6..f869b07 100644
--- a/serprog.c
+++ b/serprog.c
@@ -541,7 +541,7 @@
 {
 	if ((sp_max_write_n) && (sp_write_n_bytes))
 		sp_pass_writen();
-	sp_stream_buffer_op(S_CMD_O_EXEC, 0, 0);
+	sp_stream_buffer_op(S_CMD_O_EXEC, 0, NULL);
 	msg_pspew(MSGHEADER "Executed operation buffer of %d bytes\n",
 		     sp_opbuf_usage);
 	sp_opbuf_usage = 0;
diff --git a/udelay.c b/udelay.c
index 153f510..feae827 100644
--- a/udelay.c
+++ b/udelay.c
@@ -45,11 +45,11 @@
 	struct timeval start, end;
 	unsigned long counter = 0;
 	
-	gettimeofday(&start, 0);
+	gettimeofday(&start, NULL);
 	timeusec = 0;
 	
 	while (!timeusec && (++counter < 1000000000)) {
-		gettimeofday(&end, 0);
+		gettimeofday(&end, NULL);
 		timeusec = 1000000 * (end.tv_sec - start.tv_sec) +
 			   (end.tv_usec - start.tv_usec);
 		/* Protect against time going forward too much. */
@@ -68,9 +68,9 @@
 	unsigned long timeusec;
 	struct timeval start, end;
 	
-	gettimeofday(&start, 0);
+	gettimeofday(&start, NULL);
 	myusec_delay(usecs);
-	gettimeofday(&end, 0);
+	gettimeofday(&end, NULL);
 	timeusec = 1000000 * (end.tv_sec - start.tv_sec) +
 		   (end.tv_usec - start.tv_usec);
 	/* Protect against time going forward too much. */