ALSA: line6: Fix volume calculation for big-endian

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/line6/playback.c

@@ -31,14 +31,16 @@ static void change_volume(struct urb *urb_out, int volume[],
 		return;		/* maximum volume - no change */
 
 	if (bytes_per_frame == 4) {
-		short *p, *buf_end;
+		__le16 *p, *buf_end;
 
-		p = (short *)urb_out->transfer_buffer;
+		p = (__le16 *)urb_out->transfer_buffer;
 		buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
 
 		for (; p < buf_end; ++p) {
-			int val = (*p * volume[chn & 1]) >> 8;
-			*p = clamp(val, 0x7fff, -0x8000);
+			short pv = le16_to_cpu(*p);
+			int val = (pv * volume[chn & 1]) >> 8;
+			pv = clamp(val, 0x7fff, -0x8000);
+			*p = cpu_to_le16(pv);
 			++chn;
 		}
 	} else if (bytes_per_frame == 6) {
@@ -114,15 +116,18 @@ static void add_monitor_signal(struct urb *urb_out, unsigned char *signal,
 		return;		/* zero volume - no change */
 
 	if (bytes_per_frame == 4) {
-		short *pi, *po, *buf_end;
+		__le16 *pi, *po, *buf_end;
 
-		pi = (short *)signal;
-		po = (short *)urb_out->transfer_buffer;
+		pi = (__le16 *)signal;
+		po = (__le16 *)urb_out->transfer_buffer;
 		buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
 
 		for (; po < buf_end; ++pi, ++po) {
-			int val = *po + ((*pi * volume) >> 8);
-			*po = clamp(val, 0x7fff, -0x8000);
+			short pov = le16_to_cpu(*po);
+			short piv = le16_to_cpu(*pi);
+			int val = pov + ((piv * volume) >> 8);
+			pov = clamp(val, 0x7fff, -0x8000);
+			*po = cpu_to_le16(pov);
 		}
 	}