msm: usbaudio: Fix memory allocation for USB audio module init

Fix memory allocation issue in snd_usb_audio_init()
use sizeof(struct) insead of sizeof(pointer)

Change-Id: I270bbd7111e97dd4e0e92378f61d5025e16f5fca
Signed-off-by: Alex Fradkin <afradkin@codeaurora.org>

sound/usb/card.c

@@ -736,7 +736,7 @@ static int __init snd_usb_audio_init(void)
 		return -EINVAL;
 	}
 
-	usbaudiosdev = kzalloc(sizeof(usbaudiosdev), GFP_KERNEL);
+	usbaudiosdev = kzalloc(sizeof(*usbaudiosdev), GFP_KERNEL);
 	usbaudiosdev->name = "usb_audio_class";
 
 	err = switch_dev_register(usbaudiosdev);