RDMA/cma: Use PTR_RET rather than if (IS_ERR(...)) + PTR_ERR
RDMA/cma: Use PTR_RET rather than if (IS_ERR(...)) + PTR_ERR

Suggested by scripts/coccinelle/api/ptr_ret.cocci.

Signed-off-by: Roland Dreier <0d270388f2f92757a5de0f4bd891d3b392c44c4f@purestorage.com>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs