Free config before exiting sway.

Apart from freeing the sway_config struct, this also terminates the
swaybars spawned by sway, since they are linked by PID to the bar config
structs.

include/config.h

@@ -192,6 +192,10 @@ bool load_config(const char *file);
 /** Reads the config from the given FILE.
  */
 bool read_config(FILE *file, bool is_active);
+/**
+ * Free config struct
+ */
+void free_config(struct sway_config *config);
 /**
  * Does variable replacement for a string based on the config's currently loaded variables.
  */

sway/config.c

@@ -86,7 +86,7 @@ static void free_workspace_output(struct workspace_output *wo) {
 	free(wo);
 }
 
-static void free_config(struct sway_config *config) {
+void free_config(struct sway_config *config) {
 	int i;
 	for (i = 0; i < config->symbols->length; ++i) {
 		free_variable(config->symbols->items[i]);

sway/main.c

@@ -228,6 +228,10 @@ int main(int argc, char **argv) {
 
 	ipc_terminate();
 
+	if (config) {
+		free_config(config);
+	}
+
 	return exit_value;
 }