ext4: mark block bitmap corrupted when found instead of BUGON

ext4: mark block bitmap corrupted when found instead of BUGON

BugLink: https://bugs.launchpad.net/bugs/1900624
[ Upstream commit eb5760863fc28feab28b567ddcda7e667e638da0 ]

We already has similar code in ext4_mb_complex_scan_group(), but
ext4_mb_simple_scan_group() still affected.

Other reports: https://www.spinics.net/lists/linux-ext4/msg60231.html

Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Dmitry Monakhov <dmonakhov@gmail.com>
Link: https://lore.kernel.org/r/20200310150156.641-1-dmonakhov@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Ian May <ian.may@canonical.com>