RDMA/cxgb4: Fix crash when peer address is 0.0.0.0
RDMA/cxgb4: Fix crash when peer address is 0.0.0.0

When using rping -c -a 0.0.0.0 with iw_cxgb4, the system crashes when
rdma_connect() is called.  ip_dev_find() will return NULL, but pdev is
accessed anyway.

Checking that pdev is NULL and returning -ENODEV prevents the system
from crashing.

Signed-off-by: Thadeu Lima de Souza Cascardo <c8883472cb5fbead63941b41bccc869c7deaf90f@linux.vnet.ibm.com>
Acked-by: Steve Wise <6f43c86433b33e5fe92b209bedebd0f6dba5b49c@opengridcomputing.com>
Signed-off-by: Roland Dreier <0d270388f2f92757a5de0f4bd891d3b392c44c4f@purestorage.com>

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