ext4: remove unnecessary count2 in ext4_free_data_in_buddy

count2 is always 1 in mb_debug, just remove unnecessary count2.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://lore.kernel.org/r/20230303172120.3800725-17-shikemeng@huaweicloud.com


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