Staging: line6: workaround for null pointer bug

Signed-off-by: Markus Grabner <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/line6/capture.c

···
 	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
 	int frames = fsize / bytes_per_frame;
 
+	if (runtime == 0)
+		return;
+
 	if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
 		/*
 		   The transferred area goes over buffer boundary,

drivers/staging/line6/revision.h

···
 #ifndef DRIVER_REVISION
 /* current subversion revision */
-#define DRIVER_REVISION " (revision 684)"
+#define DRIVER_REVISION " (revision 690)"
 #endif