btrfs: No need to check !(flags & MS_RDONLY) twice

Code cleanup.
The code block is for !(*flags & MS_RDONLY). We don't need
to check it again.

Signed-off-by: Goldwyn Rodrigues <[e-mail]>
Reviewed-by: Omar Sandoval <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/super.c

···
 		}
 
 		if (fs_info->fs_devices->missing_devices >
-		     fs_info->num_tolerated_disk_barrier_failures &&
-		    !(*flags & MS_RDONLY)) {
+		     fs_info->num_tolerated_disk_barrier_failures) {
 			btrfs_warn(fs_info,
 				"too many missing devices, writeable remount is not allowed");
 			ret = -EACCES;