siano: get rid of an unused return code for debugfs register

The siano's debugfs register logic is optional: it should be ok
if it fails. So, no need to check if debufs register succeeded.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/common/siano/smsdvb.h

@@ -107,7 +107,7 @@ struct RECEPTION_STATISTICS_PER_SLICES_S {
 
 int smsdvb_debugfs_create(struct smsdvb_client_t *client);
 void smsdvb_debugfs_release(struct smsdvb_client_t *client);
-int smsdvb_debugfs_register(void);
+void smsdvb_debugfs_register(void);
 void smsdvb_debugfs_unregister(void);
 
 #else
@@ -119,10 +119,7 @@ static inline int smsdvb_debugfs_create(struct smsdvb_client_t *client)
 
 static inline void smsdvb_debugfs_release(struct smsdvb_client_t *client) {}
 
-static inline int smsdvb_debugfs_register(void)
-{
-	return 0;
-};
+static inline void smsdvb_debugfs_register(void) {}
 
 static inline void smsdvb_debugfs_unregister(void) {};