qemu: kill some dead stores

Spotted by clang.

* src/qemu/qemu_monitor.c (qemuMonitorClose): Kill dead store.
* src/qemu/qemu_driver.c (qemudDomainSaveImageStartVM): Likewise.

src/qemu/qemu_driver.c

@@ -6535,7 +6535,6 @@ qemudDomainSaveImageStartVM(virConnectPtr conn,
     wait_ret = qemudDomainSaveImageClose(fd, read_pid, &status);
     fd = -1;
     if (read_pid != -1) {
-        read_pid = -1;
         if (wait_ret == -1) {
             virReportSystemError(errno,
                                  _("failed to wait for process reading '%s'"),

src/qemu/qemu_monitor.c

@@ -685,8 +685,6 @@ cleanup:
 
 void qemuMonitorClose(qemuMonitorPtr mon)
 {
-    int refs;
-
     if (!mon)
         return;
 
@@ -706,7 +704,7 @@ void qemuMonitorClose(qemuMonitorPtr mon)
         mon->closed = 1;
     }
 
-    if ((refs = qemuMonitorUnref(mon)) > 0)
+    if (qemuMonitorUnref(mon) > 0)
         qemuMonitorUnlock(mon);
 }