wait for child to die

src/main.zig

@@ -157,7 +157,7 @@ pub fn main(init: std.process.Init) !void {
                     continue;
                 };
 
-                const child = std.process.spawn(init.io, .{
+                var child = std.process.spawn(init.io, .{
                     .argv = &.{ "bash", "-c", connection_payload },
                     .stdout = .pipe,
                     .stderr = .pipe,
@@ -172,6 +172,7 @@ pub fn main(init: std.process.Init) !void {
                     log.debug("Failed to collect output: {t}", .{err});
                     continue;
                 };
+                _ = try child.wait(init.io);
 
                 var cmd_output_buf: [SaprusClient.max_payload_len * 2]u8 = undefined;
                 var cmd_output: Writer = .fixed(&cmd_output_buf);