va: fix warning about memset.

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>

va/va_fool.c

@@ -217,7 +217,7 @@ int va_FoolEnd(VADisplay dpy)
     if (fool_context[idx].codebuf)
         free(fool_context[idx].codebuf);
 
-    memset(&fool_context[idx], sizeof(struct _fool_context), 0);
+    memset(&fool_context[idx], 0, sizeof(struct _fool_context));
     return 0;
 }
 

va/va_trace.c

@@ -244,7 +244,7 @@ void va_TraceEnd(VADisplay dpy)
     if (trace_context[idx].trace_fp_surface && (trace_context[idx].trace_fp_surface != stderr))
         fclose(trace_context[idx].trace_fp_surface);
 
-    memset(&trace_context[idx], sizeof(struct _trace_context), 0);
+    memset(&trace_context[idx], 0, sizeof(struct _trace_context));
 }