Revert "ext4: verify dir block before splitting it"

This reverts commit da2f0591 which is
commit 46c116b9 upstream,  as it breaks
the build in Android kernel builds due to out-of-tree changes that were
never merged upstream.

Bug: 236690716
Fixes: 0e8e9891 ("Merge 5.10.121 into android12-5.10-lts")
Cc: Daniel Rosenberg <drosen@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I08929715fb488a7d1977300e84d0940a9bf4dc98