FROMGIT: f2fs: fix to remove unnecessary f2fs_bug_on() to avoid panic

verify_blkaddr() will trigger panic once we inject fault into
f2fs_is_valid_blkaddr(), fix to remove this unnecessary f2fs_bug_on().

Fixes: 18792e64 ("f2fs: support fault injection for f2fs_is_valid_blkaddr()")
Reviewed-by: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Bug: 313549450
(cherry picked from commit b896e302
 https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git

 dev)
Change-Id: Ibffad271c17efd219099f07aab54ac080cae4fba
Signed-off-by: Daeho Jeong <daehojeong@google.com>