RDMA: Handle the return code from dma_resv_wait_timeout() properly

ib_umem_dmabuf_map_pages() returns 0 on success and -ERRNO on failure.

dma_resv_wait_timeout() uses a different scheme:

 * Returns -ERESTARTSYS if interrupted, 0 if the wait timed out, or
 * greater than zero on success.

This results in ib_umem_dmabuf_map_pages() being non-functional as a
positive return will be understood to be an error by drivers.

Fixes: f30bceab16d1 ("RDMA: use dma_resv_wait() instead of extracting the fence")
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Tested-by: Maor Gottlieb <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>

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