scsi: ch.c fix shadowed variable warnings

index 7aad154..f9c3f3a 100644
@@ -268,16 +268,16 @@ ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
 static int
 ch_init_elem(scsi_changer *ch)
 {
-	int err;
+	int ch_err;
 	u_char cmd[6];
 
 	vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n");
 	memset(cmd,0,sizeof(cmd));
 	cmd[0] = INITIALIZE_ELEMENT_STATUS;
 	cmd[1] = ch->device->lun << 5;
-	err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
+	ch_err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
 	vprintk("... finished\n");
-	return err;
+	return ch_err;
 }
 
 static int

@@ -721,7 +721,7 @@ static long ch_ioctl(struct file *file,
 	case CHIOGELEM:
 	{
 		struct changer_get_element cge;
-		u_char  cmd[12];
+		u_char  ch_cmd[12];
 		u_char  *buffer;
 		unsigned int elem;
 		int     result,i;

@@ -739,17 +739,18 @@ static long ch_ioctl(struct file *file,
 		mutex_lock(&ch->lock);
 
 	voltag_retry:
-		memset(cmd,0,sizeof(cmd));
-		cmd[0] = READ_ELEMENT_STATUS;
-		cmd[1] = (ch->device->lun << 5) |
-			(ch->voltags ? 0x10 : 0) |
-			ch_elem_to_typecode(ch,elem);
-		cmd[2] = (elem >> 8) & 0xff;
-		cmd[3] = elem        & 0xff;
-		cmd[5] = 1;
-		cmd[9] = 255;
-
-		if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
+		memset(ch_cmd,0,sizeof(ch_cmd));
+		ch_cmd[0] = READ_ELEMENT_STATUS;
+		ch_cmd[1] = (ch->device->lun << 5) |
+			    (ch->voltags ? 0x10 : 0) |
+			    ch_elem_to_typecode(ch,elem);
+		ch_cmd[2] = (elem >> 8) & 0xff;
+		ch_cmd[3] = elem        & 0xff;
+		ch_cmd[5] = 1;
+		ch_cmd[9] = 255;
+
+		result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE);
+		if (!result) {
 			cge.cge_status = buffer[18];
 			cge.cge_flags = 0;
 			if (buffer[18] & CESTATUS_EXCEPT) {