Fix 32bit vs. 64bit long int arithematics

Corresponding to flashrom svn r8 and coreboot v2 svn r1434.
diff --git a/sst28sf040.c b/sst28sf040.c
index ee49f79..c63f5fa 100644
--- a/sst28sf040.c
+++ b/sst28sf040.c
@@ -31,7 +31,7 @@
 
 #define AUTO_PG_ERASE1		0x20
 #define AUTO_PG_ERASE2		0xD0
-#define AUTO_PGRM			0x10
+#define AUTO_PGRM		0x10
 #define CHIP_ERASE		0x30
 #define RESET			0xFF
 #define READ_ID			0x90