treewide: Add __GFP_NOWARN to k.alloc calls with v.alloc fallbacks

Don't emit OOM warnings when k.alloc calls fail when
there there is a v.alloc immediately afterwards.

Converted a kmalloc/vmalloc with memset to kzalloc/vzalloc.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/net/ethernet/chelsio/cxgb3/cxgb3_offload.c

@@ -1157,7 +1157,7 @@ static void cxgb_redirect(struct dst_entry *old, struct dst_entry *new,
  */
 void *cxgb_alloc_mem(unsigned long size)
 {
-	void *p = kzalloc(size, GFP_KERNEL);
+	void *p = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
 
 	if (!p)
 		p = vzalloc(size);