Catch an error that came up when running (missing binary)

zig/sdl/hello_sdl.zig

@@ -170,7 +170,15 @@ const RegexRunner = struct {
        // stop already running command, restart with new cmd
        if (self.process) |*process| {
            if (process.is_running()) {
                _ = try process.process.kill();
                _ = process.process.kill() catch |err| switch (err) {
                    error.FileNotFound => {
                        // TODO: report error to user
                        std.debug.print("killing: {s}\n", .{err});
                    },
                    else => {
                        return err;
                    },
                };
                process.deinit();
            }
        }