staging/rdma/hfi1: Use pointer instead of struct name

Use sizeof(*p) instead of sizeof(struct foo) to fix checkpatch check:
CHECK: Prefer alloc(sizeof(*p)...) over alloc(sizeof(struct foo)...)
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/staging/rdma/hfi1/pio.c

@@ -700,7 +700,7 @@ struct send_context *sc_alloc(struct hfi1_devdata *dd, int type,
 	if (dd->flags & HFI1_FROZEN)
 		return NULL;
 
-	sc = kzalloc_node(sizeof(struct send_context), GFP_KERNEL, numa);
+	sc = kzalloc_node(sizeof(*sc), GFP_KERNEL, numa);
 	if (!sc)
 		return NULL;