ANDROID: Incremental fs: Fix four error-path bugs

Test: incfs_test passes
Bug: 158242405
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: Ib53e867fb2681489f720f6255354c1bce1d33997
(cherry picked from commit 60bc6eaf985358638af7f0602a7aece907ae8207)
Git-commit: a556403a
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>