virPidFileConstructPath: Drop useless VIR_FREE()

If a virAsprintf() within the function fails, we call VIR_FREE()
over @rundir variable and jump onto cleanup label, where it is
freed again.  It doesn't hurt, but not make much sense too.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/util/virpidfile.c

@@ -556,11 +556,8 @@ virPidFileConstructPath(bool privileged,
             goto cleanup;
         }
 
-        if (virAsprintf(pidfile, "%s/%s.pid", rundir, progname) < 0) {
-            VIR_FREE(rundir);
+        if (virAsprintf(pidfile, "%s/%s.pid", rundir, progname) < 0)
             goto cleanup;
-        }
-
     }
 
     ret = 0;