kselftests: dmabuf-heaps: Fix confused return value on expected error testing

When I added the expected error testing, I forgot I need to set
the return to zero when we successfully see an error.

Without this change we only end up testing a single heap
before the test quits.

Cc: Shuah Khan <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: Benjamin Gaignard <[email protected]>
Cc: Brian Starkey <[email protected]>
Cc: Laura Abbott <[email protected]>
Cc: "Andrew F. Davis" <[email protected]>
Cc: [email protected]
Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

0 files changed, 0 insertions, 0 deletions