Staging: rtl8712: Avoid multiple assignments.

Avoid multiple assignments.This isssue is found by checkpatch.pl script.
Signed-off-by: Sandhya Bankar <bankarsandhya512@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/recv_linux.c

@@ -44,7 +44,8 @@
 int r8712_os_recv_resource_alloc(struct _adapter *padapter,
 				 union recv_frame *precvframe)
 {
-	precvframe->u.hdr.pkt_newalloc = precvframe->u.hdr.pkt = NULL;
+	precvframe->u.hdr.pkt_newalloc = NULL;
+	precvframe->u.hdr.pkt = NULL;
 	return _SUCCESS;
 }