misc: mic: fix incorrect use of error codes in SCIF DMA driver

The error code passed to ERR_PTR() always should be negated.  Also, the
return value of scif_add_mmu_notifier() was never checked.

Signed-off-by: Eric Biggers <[email protected]>
Reviewed-by: Sudeep Dutt <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
1 file changed