daemon: fix memory leak in daemonUnixSocketPaths

@rundir, allocated by virGetUserRuntimeDirectory, is leaked in case
virFileMakePath fails.
Signed-off-by: NXi Xu <xu.xi8@zte.com.cn>
Signed-off-by: NErik Skultety <eskultet@redhat.com>

daemon/libvirtd.c

@@ -288,6 +288,7 @@ daemonUnixSocketPaths(struct daemonConfig *config,
             old_umask = umask(077);
             if (virFileMakePath(rundir) < 0) {
                 umask(old_umask);
+                VIR_FREE(rundir);
                 goto error;
             }
             umask(old_umask);