rootless: fix fast join userns path

commit ab88632 changed the path for
the pause.pid file but didn't update the same path in the C code.
This prevented Podman to take the fast path when the userns is already
created and to join it without re-execing itself.

Fix the path in the C code as well so we can join the rootless
user+mount namespace without having to re-exec Podman.

[NO TESTS NEEDED]

Signed-off-by: Giuseppe Scrivano <[email protected]>

pkg/rootless/rootless_linux.c

@@ -333,7 +333,7 @@ static void __attribute__((constructor)) init()
       uid_t uid;
       gid_t gid;
       char path[PATH_MAX];
-      const char *const suffix = "/libpod/pause.pid";
+      const char *const suffix = "/libpod/tmp/pause.pid";
       char *cwd = getcwd (NULL, 0);
       char uid_fmt[16];
       char gid_fmt[16];