[PATCH] USB: Remove unneeded kmalloc() return value casts

Remove kmalloc() return value casts that we don't need from
drivers/usb/*

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/media/usbvideo.c b/drivers/usb/media/usbvideo.c
index af05859..4bd1133 100644
--- a/drivers/usb/media/usbvideo.c
+++ b/drivers/usb/media/usbvideo.c
@@ -725,7 +725,7 @@
 		/* Allocate user_data separately because of kmalloc's limits */
 		if (num_extra > 0) {
 			up->user_size = num_cams * num_extra;
-			up->user_data = (char *) kmalloc(up->user_size, GFP_KERNEL);
+			up->user_data = kmalloc(up->user_size, GFP_KERNEL);
 			if (up->user_data == NULL) {
 				err("%s: Failed to allocate user_data (%d. bytes)",
 				    __FUNCTION__, up->user_size);