Log an error message when nv_mem_client_init() fails due to missing IB peer memory symbols.

Fixes https://forums.developer.nvidia.com/t/290774

kernel-open/nvidia-peermem/nvidia-peermem.c

@@ -562,6 +562,7 @@ out:
 
     return rc;
 #else
+    peer_err("module compiled without IB peer memory symbols present\n");
     return -EINVAL;
 #endif
 }