ANDROID: fix up ext4 build from 4.19.183

In commit b7ff91fd030d ("ext4: find old entry again if failed to rename
whiteout") a new call to ext4_find_entry() was made, but in commit
705a3e5b1852 ("ANDROID: ext4: Handle casefolding with encryption")
only in the ANDROID tree, a new parameter is added to that function.

Add NULL there to keep the build working, hopefully one-day the
out-of-tree patch will get merged upstream...

Fixes: 705a3e5b1852 ("ANDROID: ext4: Handle casefolding with encryption")
Fixes: b7ff91fd030d ("ext4: find old entry again if failed to rename whiteout")
Cc: Daniel Rosenberg <drosen@google.com>
Cc: Paul Lawrence <paullawrence@google.com>
Bug: 138322712
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com&gt;BB>
Change-Id: I69b7f9c12d1f9016b8269e5bc7878469700b6477