powerpc/fsl_rio: fix a missing error code
We should set the error code here rather than incorrectly returning 0. Otherwise static checkers complain. Link: http://lkml.kernel.org/r/20160804053525.GM775@mwandaSigned-off-by: NDan Carpenter <dan.carpenter@oracle.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Alexandre Bounine <alexandre.bounine@idt.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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