code: fix a pair of leaks

river/Output.zig

@@ -610,6 +610,9 @@ fn handleDestroy(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
     // Clean up the wlr_output
     self.wlr_output.data = null;
 
+    // Free the layout command
+    util.gpa.free(self.layout);
+
     // Remove the destroyed output from the list
     const node = @fieldParentPtr(std.TailQueue(Self).Node, "data", self);
     root.outputs.remove(node);

river/main.zig

@@ -93,6 +93,7 @@ pub fn main() anyerror!void {
     } else null;
     defer if (startup_process) |child| {
         _ = child.kill() catch |e| log.err(.server, "failed to terminate startup process: {}", .{e});
+        child.deinit();
     };
 
     log.info(.server, "running...", .{});