bar config: fix uninitialized accesses on init error

If init fails halfway through it will call the destroy function,
which needs some coherent stuff filled.
Allocate with calloc and fill in what cannot fail first

Found through static analysis.

sway/config/bar.c

@@ -70,16 +70,12 @@ void free_bar_config(struct bar_config *bar) {
 
 struct bar_config *default_bar_config(void) {
 	struct bar_config *bar = NULL;
-	bar = malloc(sizeof(struct bar_config));
+	bar = calloc(1, sizeof(struct bar_config));
 	if (!bar) {
 		return NULL;
 	}
-	if (!(bar->mode = strdup("dock"))) goto cleanup;
-	if (!(bar->hidden_state = strdup("hide"))) goto cleanup;
 	bar->outputs = NULL;
 	bar->position = strdup("bottom");
-	if (!(bar->bindings = create_list())) goto cleanup;
-	if (!(bar->status_command = strdup("while :; do date +'%Y-%m-%d %l:%M:%S %p'; sleep 1; done"))) goto cleanup;
 	bar->pango_markup = false;
 	bar->swaybar_command = NULL;
 	bar->font = NULL;
@@ -91,6 +87,19 @@ struct bar_config *default_bar_config(void) {
 	bar->binding_mode_indicator = true;
 	bar->verbose = false;
 	bar->pid = 0;
+	if (!(bar->mode = strdup("dock"))) {
+	       goto cleanup;
+	}
+	if (!(bar->hidden_state = strdup("hide"))) {
+		goto cleanup;
+	}
+	if (!(bar->bindings = create_list())) {
+		goto cleanup;
+	}
+	if (!(bar->status_command =
+			strdup("while date +'%Y-%m-%d %l:%M:%S %p'; do sleep 1; done"))) {
+		goto cleanup;
+	}
 	// set default colors
 	if (!(bar->colors.background = strndup("#000000ff", 9))) {
 		goto cleanup;