selftests/vm: fix errno handling in mrelease_test

mrelease_test should return KSFT_SKIP when process_mrelease is not
defined, but due to a perror call consuming the errno, it returns
KSFT_FAIL.

This patch decides the exit code before calling perror.

[[email protected]: fix remaining instances of errno mishandling]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 33776141b812 ("selftests: vm: add process_mrelease tests")
Signed-off-by: Adam Sindelar <[email protected]>
Reviewed-by: David Vernet <[email protected]>
Reviewed-by: Suren Baghdasaryan <[email protected]>
Cc: Shuah Khan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions