USB: usbaudio: handle kcalloc failure

sound/usb/usbaudio.c (check_hw_params_convention): Handle kcalloc failure.
Signed-off-by: NJim Meyering <meyering@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

sound/usb/usbaudio.c

@@ -1762,6 +1762,8 @@ static int check_hw_params_convention(struct snd_usb_substream *subs)
 
 	channels = kcalloc(MAX_MASK, sizeof(u32), GFP_KERNEL);
 	rates = kcalloc(MAX_MASK, sizeof(u32), GFP_KERNEL);
+	if (!channels || !rates)
+		goto __out;
 
 	list_for_each(p, &subs->fmt_list) {
 		struct audioformat *f;