[media] cx18: get rid of warning: no previous prototype

drivers/media/pci/cx18/cx18-alsa-main.c:200:5: warning: no previous prototype for 'cx18_alsa_load' [-Wmissing-prototypes]
drivers/media/pci/cx18/cx18-alsa-pcm.c:325:5: warning: no previous prototype for 'snd_cx18_pcm_create' [-Wmissing-prototypes]
drivers/media/pci/cx18/cx18-alsa-pcm.c:72:6: warning: no previous prototype for 'cx18_alsa_announce_pcm_data' [-Wmissing-prototypes]
drivers/media/pci/cx18/cx18-streams.c:100:6: warning: no previous prototype for 'cx18_dma_free' [-Wmissing-prototypes]

Cc: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/pci/cx18/cx18-alsa-main.c

@@ -197,7 +197,7 @@ err_exit:
 	return ret;
 }
 
-int cx18_alsa_load(struct cx18 *cx)
+static int __init cx18_alsa_load(struct cx18 *cx)
 {
 	struct v4l2_device *v4l2_dev = &cx->v4l2_dev;
 	struct cx18_stream *s;

drivers/media/pci/cx18/cx18-alsa-pcm.c

@@ -37,6 +37,7 @@
 #include "cx18-streams.h"
 #include "cx18-fileops.h"
 #include "cx18-alsa.h"
+#include "cx18-alsa-pcm.h"
 
 static unsigned int pcm_debug;
 module_param(pcm_debug, int, 0644);

drivers/media/pci/cx18/cx18-streams.c

@@ -97,7 +97,7 @@ static struct {
 };
 
 
-void cx18_dma_free(struct videobuf_queue *q,
+static void cx18_dma_free(struct videobuf_queue *q,
 	struct cx18_stream *s, struct cx18_videobuf_buffer *buf)
 {
 	videobuf_waiton(q, &buf->vb, 0, 0);