cifs: cifs_convert_address() returns zero on error

The cifs_convert_address() returns zero on error but this caller is
testing for negative returns.

Btw. "i" is unsigned here, so it's never negative.
Reviewed-by: NJeff Layton <jlayton@samba.org>
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>

fs/cifs/connect.c

@@ -1067,7 +1067,7 @@ cifs_parse_mount_options(char *options, const char *devname,
 			}
 			i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
 						 value, strlen(value));
-			if (i < 0) {
+			if (i == 0) {
 				printk(KERN_WARNING "CIFS:  Could not parse"
 				       " srcaddr: %s\n",
 				       value);