[media] stk1160: Handle urb allocation failure condition properly

When an urb buffer can't be allocated, the currently allocated
buffer count must be saved so they can properly released.
Moreover, it's sufficient to call stk1160_free_isoc to have
all urb buffers released.
Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/usb/stk1160/stk1160-video.c

@@ -462,8 +462,7 @@ int stk1160_alloc_isoc(struct stk1160 *dev)
 		urb = usb_alloc_urb(max_packets, GFP_KERNEL);
 		if (!urb) {
 			stk1160_err("cannot alloc urb[%d]\n", i);
-			stk1160_uninit_isoc(dev);
-			return -ENOMEM;
+			goto free_i_bufs;
 		}
 		dev->isoc_ctl.urb[i] = urb;
 
@@ -474,10 +473,9 @@ int stk1160_alloc_isoc(struct stk1160 *dev)
 		dev->isoc_ctl.transfer_buffer[i] = kmalloc(sb_size, GFP_KERNEL);
 #endif
 		if (!dev->isoc_ctl.transfer_buffer[i]) {
-			stk1160_err("cannot alloc %d bytes for tx buffer\n",
-				sb_size);
-			stk1160_uninit_isoc(dev);
-			return -ENOMEM;
+			stk1160_err("cannot alloc %d bytes for tx[%d] buffer\n",
+				sb_size, i);
+			goto free_i_bufs;
 		}
 		memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);
 
@@ -514,5 +512,11 @@ int stk1160_alloc_isoc(struct stk1160 *dev)
 	dev->isoc_ctl.num_bufs = num_bufs;
 
 	return 0;
+
+free_i_bufs:
+	/* Save the allocated buffers so far, so we can properly free them */
+	dev->isoc_ctl.num_bufs = i+1;
+	stk1160_free_isoc(dev);
+	return -ENOMEM;
 }