virsh: avoid uninitialized variable

Detected by Coverity; neither vshCmddefHelp nor vshCmdOptParse
was initializing opts_required.

* tools/virsh.c (vshCmddefOptParse): Always initialize bitmaps.

tools/virsh.c

@@ -11915,12 +11915,15 @@ vshCmddefGetInfo(const vshCmdDef * cmd, const char *name)
 }
 
 static int
-vshCmddefOptParse(const vshCmdDef *cmd, uint32_t* opts_need_arg,
+vshCmddefOptParse(const vshCmdDef *cmd, uint32_t *opts_need_arg,
                   uint32_t *opts_required)
 {
     int i;
     bool optional = false;
 
+    *opts_need_arg = 0;
+    *opts_required = 0;
+
     if (!cmd->opts)
         return 0;