staging: rtl8712: Remove explicit NULL comparison

Replace the explicit "if (val != NULL)" with if (val).

Signed-off-by: Muhammad Falak R Wani <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rtl8712/rtl8712_xmit.c

···
 	/* 1st frame dequeued */
 	pxmitframe = dequeue_xframe_ex(pxmitpriv, phwxmits, hwentry);
 	/* need to remember the 1st frame */
-	if (pxmitframe != NULL) {
+	if (pxmitframe) {
 
 #ifdef CONFIG_R8712_TX_AGGR
 		/* 1. dequeue 2nd frame
···
 			r8712_free_xmitbuf(pxmitpriv, pxmitbuf);
 			return false;
 		}
-		if (p2ndxmitframe != NULL)
+		if (p2ndxmitframe)
 			if (p2ndxmitframe->frame_tag != DATA_FRAMETAG) {
 				r8712_free_xmitbuf(pxmitpriv, pxmitbuf);
 				return false;
 			}
 		r8712_xmitframe_aggr_1st(pxmitbuf, pxmitframe);
-		if (p2ndxmitframe != NULL) {
+		if (p2ndxmitframe) {
 			u16 total_length;
 
 			total_length = r8712_xmitframe_aggr_next(
···
 			do {
 				p2ndxmitframe = dequeue_xframe_ex(
 					pxmitpriv, phwxmits, hwentry);
-				if (p2ndxmitframe != NULL)
+				if (p2ndxmitframe)
 					total_length =
 						r8712_xmitframe_aggr_next(
 							pxmitbuf,