usb: gadget: uvc: fix some error codes

We're basically saying ERR_CAST(NULL) and PTR_ERR(NULL) here, which is
nonsensical.

Acked-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/function/uvc_configfs.c

@@ -148,7 +148,7 @@ static struct config_item *uvcg_control_header_make(struct config_group *group,
 
 	h = kzalloc(sizeof(*h), GFP_KERNEL);
 	if (!h)
-		return ERR_CAST(h);
+		return ERR_PTR(-ENOMEM);
 
 	h->desc.bLength			= UVC_DT_HEADER_SIZE(1);
 	h->desc.bDescriptorType		= USB_DT_CS_INTERFACE;
@@ -840,7 +840,7 @@ static int uvcg_streaming_header_allow_link(struct config_item *src,
 
 	format_ptr = kzalloc(sizeof(*format_ptr), GFP_KERNEL);
 	if (!format_ptr) {
-		ret = PTR_ERR(format_ptr);
+		ret = -ENOMEM;
 		goto out;
 	}
 	ret = 0;
@@ -960,7 +960,7 @@ static struct config_item
 
 	h = kzalloc(sizeof(*h), GFP_KERNEL);
 	if (!h)
-		return ERR_CAST(h);
+		return ERR_PTR(-ENOMEM);
 
 	INIT_LIST_HEAD(&h->formats);
 	h->desc.bDescriptorType		= USB_DT_CS_INTERFACE;
@@ -1278,7 +1278,7 @@ static struct config_item *uvcg_frame_make(struct config_group *group,
 
 	h = kzalloc(sizeof(*h), GFP_KERNEL);
 	if (!h)
-		return ERR_CAST(h);
+		return ERR_PTR(-ENOMEM);
 
 	h->frame.b_descriptor_type		= USB_DT_CS_INTERFACE;
 	h->frame.b_frame_index			= 1;
@@ -1563,7 +1563,7 @@ static struct config_group *uvcg_uncompressed_make(struct config_group *group,
 
 	h = kzalloc(sizeof(*h), GFP_KERNEL);
 	if (!h)
-		return ERR_CAST(h);
+		return ERR_PTR(-ENOMEM);
 
 	h->desc.bLength			= UVC_DT_FORMAT_UNCOMPRESSED_SIZE;
 	h->desc.bDescriptorType		= USB_DT_CS_INTERFACE;
@@ -1772,7 +1772,7 @@ static struct config_group *uvcg_mjpeg_make(struct config_group *group,
 
 	h = kzalloc(sizeof(*h), GFP_KERNEL);
 	if (!h)
-		return ERR_CAST(h);
+		return ERR_PTR(-ENOMEM);
 
 	h->desc.bLength			= UVC_DT_FORMAT_MJPEG_SIZE;
 	h->desc.bDescriptorType		= USB_DT_CS_INTERFACE;
@@ -2124,7 +2124,7 @@ static int uvcg_streaming_class_allow_link(struct config_item *src,
 	count += 2; /* color_matching, NULL */
 	*class_array = kcalloc(count, sizeof(void *), GFP_KERNEL);
 	if (!*class_array) {
-		ret = PTR_ERR(*class_array);
+		ret = -ENOMEM;
 		goto unlock;
 	}