Avoid Coverity DEADCODE warning

Commit '922b7fda' resulted in two DEADCODE warnings from Coverity in
remoteDispatchAuthPolkit and virAccessDriverPolkitFormatProcess.
Commit '604ae657' modified the daemon.c code to remove the deadcode
issue, but did not do so for viracessdriverpolkit.c. This just mimics
the same changes

src/access/viraccessdriverpolkit.c

@@ -76,8 +76,9 @@ virAccessDriverPolkitFormatProcess(const char *actionid)
     const char *callerTime = NULL;
     const char *callerUid = NULL;
     char *ret = NULL;
-    bool supportsuid = false;
+#ifndef PKCHECK_SUPPORTS_UID
     static bool polkitInsecureWarned;
+#endif
 
     if (!identity) {
         virAccessError(VIR_ERR_ACCESS_DENIED,
@@ -109,19 +110,17 @@ virAccessDriverPolkitFormatProcess(const char *actionid)
     }
 
 #ifdef PKCHECK_SUPPORTS_UID
-    supportsuid = true;
-#endif
-    if (supportsuid) {
-        if (virAsprintf(&ret, "%s,%s,%s", callerPid, callerTime, callerUid) < 0)
-            goto cleanup;
-    } else {
-        if (!polkitInsecureWarned) {
-            VIR_WARN("No support for caller UID with pkcheck. This deployment is known to be insecure.");
-            polkitInsecureWarned = true;
-        }
-        if (virAsprintf(&ret, "%s,%s", callerPid, callerTime) < 0)
-            goto cleanup;
+    if (virAsprintf(&ret, "%s,%s,%s", callerPid, callerTime, callerUid) < 0)
+        goto cleanup;
+#else
+    if (!polkitInsecureWarned) {
+        VIR_WARN("No support for caller UID with pkcheck. "
+                 "This deployment is known to be insecure.");
+        polkitInsecureWarned = true;
     }
+    if (virAsprintf(&ret, "%s,%s", callerPid, callerTime) < 0)
+        goto cleanup;
+#endif
 
 cleanup:
     virObjectUnref(identity);