libmobile: incorrect function return type

libmobile.c

@@ -297,7 +297,7 @@ struct json_object *mobile_get_system_info(struct dongle *dev)
 	return NULL;
 }
 
-void *set_lib_debug(int debug_level)
+void set_lib_debug(int debug_level)
 {
 	if (debug_level > 1 || debug_level < 0) {
 		lib_debug_print("Only debug levels 0 and 1 are available for the library debugging\n");

libmobile.h

@@ -48,5 +48,5 @@ struct json_object *mobile_get_sim_state(struct dongle *dev);
 struct json_object *mobile_activate_sim(struct dongle *dev, char *pin);
 struct json_object *mobile_get_remaining_tries_puk(struct dongle *dev);
 struct json_object *mobile_get_traffic_statistics(struct dongle *dev);
-void *set_lib_debug(int debug_level)
+void set_lib_debug(int debug_level)
 #endif