btrfs: adjust while loop condition in run_delalloc_nocow

We have the following pattern

while (1) {
	if (cur_offset > end)
		break;
}

Which is just

while (cur_offset <= end) {
	...
}

so adjust the code to be more clear.
Reviewed-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/inode.c

@@ -1988,7 +1988,7 @@ static noinline int run_delalloc_nocow(struct btrfs_inode *inode,
 	nocow_args.end = end;
 	nocow_args.writeback_path = true;
 
-	while (1) {
+	while (cur_offset <= end) {
 		struct btrfs_block_group *nocow_bg = NULL;
 		struct btrfs_ordered_extent *ordered;
 		struct btrfs_key found_key;
@@ -2192,8 +2192,6 @@ static noinline int run_delalloc_nocow(struct btrfs_inode *inode,
 		 */
 		if (ret)
 			goto error;
-		if (cur_offset > end)
-			break;
 	}
 	btrfs_release_path(path);