Get rid of perror()

It prints to stderr and that's not what we want necesserily;
using msg_*err gives us more control.

Corresponding to flashrom svn r1668.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/flashrom.c b/flashrom.c
index 14bb1b3..c11f723 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -29,6 +29,7 @@
 #endif
 #include <string.h>
 #include <stdlib.h>
+#include <errno.h>
 #include <ctype.h>
 #include <getopt.h>
 #if HAVE_UTSNAME == 1
@@ -1158,11 +1159,11 @@
 	struct stat image_stat;
 
 	if ((image = fopen(filename, "rb")) == NULL) {
-		perror(filename);
+		msg_gerr("Error: opening file \"%s\" failed: %s\n", filename, strerror(errno));
 		return 1;
 	}
 	if (fstat(fileno(image), &image_stat) != 0) {
-		perror(filename);
+		msg_gerr("Error: getting metadata of file \"%s\" failed: %s\n", filename, strerror(errno));
 		fclose(image);
 		return 1;
 	}
@@ -1174,7 +1175,7 @@
 	}
 	numbytes = fread(buf, 1, size, image);
 	if (fclose(image)) {
-		perror(filename);
+		msg_gerr("Error: closing file \"%s\" failed: %s\n", filename, strerror(errno));
 		return 1;
 	}
 	if (numbytes != size) {
@@ -1196,7 +1197,7 @@
 		return 1;
 	}
 	if ((image = fopen(filename, "wb")) == NULL) {
-		perror(filename);
+		msg_gerr("Error: opening file \"%s\" failed: %s\n", filename, strerror(errno));
 		return 1;
 	}