lshal: Fix empty hidl_array access.

Fix this error:
  Abort message: 'Check failed: bytes != nullptr || len == 0 0x0 32'

This bug is introduced by the change below.
!hashRet.isOk() should have a break; in it like the other error cases.
The change below added this code after the error which used to be
the end of the statement.

Bug: 329190736
Fixes: b670dd7e
  ("lshal: Fix mem invalid access (timeoutIPC callers)")
Test: TH
Change-Id: Iada52b2ca033105962727fcccf651fbb5bdd5736