ext4: return found group directly in ext4_mb_choose_next_group_best_avail

Return good group when it's found in loop to remove futher check if good
group is found after loop.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20230801143204.2284343-10-shikemeng@huaweicloud.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>