bnx2x: Use napi_alloc_frag()

SKB allocation via bnx2x_frag_alloc() is always performed in NAPI
context. Preemptible context passes GFP_KERNEL and bnx2x_frag_alloc()
uses then __get_free_page() for the allocation.

Use napi_alloc_frag() for memory allocation.

Cc: Ariel Elior <[e-mail]>
Cc: Sudarsana Kalluru <[e-mail]>
Cc: [e-mail]
Signed-off-by: Sebastian Andrzej Siewior <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c

···
 		if (unlikely(gfpflags_allow_blocking(gfp_mask)))
 			return (void *)__get_free_page(gfp_mask);
 
-		return netdev_alloc_frag(fp->rx_frag_size);
+		return napi_alloc_frag(fp->rx_frag_size);
 	}
 
 	return kmalloc(fp->rx_buf_size + NET_SKB_PAD, gfp_mask);