staging: rtl8712: r8712_wlanhdr_to_ethhdr(): Change return values

Change return values of r8712_wlanhdr_to_ethhdr from _SUCCESS/_FAIL to
0/-ENOMEM. Modify the function containing a call site of
r8712_wlanhdr_to_ethhdr so that it compares the return value to
0/-ENOMEM instead of _SUCCESS/_FAIL.
Change the return type of r8712_wlanhdr_to_ethhdr from sint to int to
match its prototype in corresponding .h file.

Signed-off-by: Nishka Dasgupta <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rtl8712/rtl8712_recv.c

···
 		}
 	} else { /*B/G mode*/
 		retval = r8712_wlanhdr_to_ethhdr(prframe);
-		if (retval != _SUCCESS)
-			return retval;
+		if (retval)
+			return _FAIL;
 		if (!padapter->driver_stopped && !padapter->surprise_removed) {
 			/* indicate this recv_frame */
 			r8712_recv_indicatepkt(padapter, prframe);

drivers/staging/rtl8712/rtl871x_recv.c

···
 	return retval;
 }
 
-sint r8712_wlanhdr_to_ethhdr(union recv_frame *precvframe)
+int r8712_wlanhdr_to_ethhdr(union recv_frame *precvframe)
 {
 	/*remove the wlanhdr and add the eth_hdr*/
 	sint	rmv_len;
···
 		ptr = recvframe_pull(precvframe, (rmv_len -
 		      sizeof(struct ethhdr) + 2) - 24);
 		if (!ptr)
-			return _FAIL;
+			return -ENOMEM;
 		memcpy(ptr, get_rxmem(precvframe), 24);
 		ptr += 24;
 	} else {
 		ptr = recvframe_pull(precvframe, (rmv_len -
 		      sizeof(struct ethhdr) + (bsnaphdr ? 2 : 0)));
 		if (!ptr)
-			return _FAIL;
+			return -ENOMEM;
 	}
 
 	memcpy(ptr, pattrib->dst, ETH_ALEN);
···
 
 		memcpy(ptr + 12, &be_tmp, 2);
 	}
-	return _SUCCESS;
+	return 0;
 }
 
 s32 r8712_recv_entry(union recv_frame *precvframe)