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>

cli_output.c

@@ -50,7 +50,7 @@ int open_logfile(const char * const filename)
 		return 1;
 	}
 	if ((logfile = fopen(filename, "w")) == NULL) {
-		perror(filename);
+		msg_gerr("Error: opening log file \"%s\" failed: %s\n", filename, strerror(errno));
 		return 1;
 	}
 	return 0;