build: remove dead variables

Detected by Coverity.  No real harm in leaving these, but fixing
them cuts down on the noise for future analysis.

* src/rpc/virnetserver.c (virNetServerAddService): Delete unused
entry.
* src/util/sysinfo.c (virSysinfoRead): Delete dead assignment to
base.

src/rpc/virnetserver.c

@@ -529,11 +529,10 @@ int virNetServerAddService(virNetServerPtr srv,
 #if HAVE_AVAHI
     if (mdnsEntryName) {
         int port = virNetServerServiceGetPort(svc);
-        virNetServerMDNSEntryPtr entry;
 
-        if (!(entry = virNetServerMDNSAddEntry(srv->mdnsGroup,
-                                               mdnsEntryName,
-                                               port)))
+        if (!virNetServerMDNSAddEntry(srv->mdnsGroup,
+                                      mdnsEntryName,
+                                      port))
             goto error;
     }
 #endif

src/util/sysinfo.c

@@ -472,7 +472,7 @@ virSysinfoRead(void) {
 
     ret->nmemory = 0;
     ret->memory = NULL;
-    if ((base = virSysinfoParseMemory(base, ret)) == NULL)
+    if (virSysinfoParseMemory(base, ret) == NULL)
         goto no_memory;
 
 cleanup: