btrfs-progs: resize: properly return error from check_resize_args

The function almost always returns 0 even for errors as the ret value is
not used in the final return. This was attempted to be fixed in
55438f3 ("btrfs-progs: resize: return error value from
check_resize_args()") but this broke 'resize cancel' when devid 1 was
missing and was later reverted as 4286eb5 ("Revert "btrfs-progs:
resize: return error value from check_resize_args()"").

The devid fallback has been fixed so the proper return value can be
returned now.

Issue: #539
Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

cmds/filesystem.c

@@ -1242,6 +1242,7 @@ static int check_resize_args(const char *amount, const char *path, u64 *devid_re
 		ret = 1;
 		goto out;
 	}
+	ret = 0;
 
 	/* Cancel does not need to determine the device number. */
 	if (strcmp(amount, "cancel") == 0) {
@@ -1351,7 +1352,7 @@ static int check_resize_args(const char *amount, const char *path, u64 *devid_re
 
 out:
 	free(di_args);
-	return 0;
+	return ret;
 }
 
 static int cmd_filesystem_resize(const struct cmd_struct *cmd,