linux-pipewire: Return actual type in obs_pipewire_create

Instead of returning an opaque void* pointer, return the leaf
C type obs_pipewire_data*.

This commit introduces no functional changes.

plugins/linux-pipewire/pipewire.c

@@ -868,7 +868,7 @@ static void play_pipewire_stream(obs_pipewire_data *obs_pw)
 
 /* obs_source_info methods */
 
-void *obs_pipewire_create(int pipewire_fd, int pipewire_node)
+obs_pipewire_data *obs_pipewire_create(int pipewire_fd, int pipewire_node)
 {
 	obs_pipewire_data *obs_pw = bzalloc(sizeof(obs_pipewire_data));
 

plugins/linux-pipewire/pipewire.h

@@ -24,7 +24,7 @@
 
 typedef struct _obs_pipewire_data obs_pipewire_data;
 
-void *obs_pipewire_create(int pipewire_fd, int pipewire_node);
+obs_pipewire_data *obs_pipewire_create(int pipewire_fd, int pipewire_node);
 void obs_pipewire_destroy(obs_pipewire_data *obs_pw);
 
 void obs_pipewire_show(obs_pipewire_data *obs_pw);