[ALSA] vxpocket - Fix wrong index assignment

Digigram VX Pocket driver
Fixed the wrong index number assignment.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pcmcia/vx/vxpocket.c

@@ -407,7 +407,7 @@ static dev_link_t *vxpocket_attach(void)
 		return NULL;
 	}
 
-	vxp->index = index[i];
+	vxp->index = i;
 	card_alloc |= 1 << i;
 
 	/* Chain drivers */