daemon-helper: remove unused variables

They were backported from 229bebfae9 ('nm-daemon-helper: add "service"
argument') but they are not needed in this branch because they were only
used by c42f6f0997 ('daemon-helper: use _nm_strerror_r() to avoid
non-thread-safe strerror()') which is not backported.

As they are unused they trigger a warning, remove them.

src/nm-daemon-helper/nm-daemon-helper.c

@@ -112,9 +112,6 @@ cmd_resolve_address(void)
             printf("%s", name);
             return RETURN_SUCCESS;
         } else if (ret == EAI_SYSTEM) {
-            char buf[1024];
-            int  errsv = errno;
-
             fprintf(stderr,
                     "getnameinfo() via service '%s' failed: %d (%s), system error: %d (%s)\n",
                     service,