webservices/tests: Fully initialize xmlstr.

dlls/webservices/tests/reader.c

@@ -4048,6 +4048,7 @@ static void test_WsResetError(void)
     WsFreeError( error );
 
     memset( &fault, 0, sizeof(fault) );
+    memset( &xmlstr, 0, sizeof(xmlstr) );
     xmlstr.bytes = (BYTE *)"str";
     xmlstr.length = 3;
 
@@ -4056,7 +4057,7 @@ static void test_WsResetError(void)
 
     hr = WsSetFaultErrorProperty( error, WS_FAULT_ERROR_PROPERTY_FAULT, &fault, sizeof(fault) );
     ok( hr == S_OK, "got %#lx\n", hr );
-    hr = WsSetFaultErrorProperty( error, WS_FAULT_ERROR_PROPERTY_ACTION, &xmlstr, sizeof(WS_XML_STRING) );
+    hr = WsSetFaultErrorProperty( error, WS_FAULT_ERROR_PROPERTY_ACTION, &xmlstr, sizeof(xmlstr) );
     ok( hr == S_OK, "got %#lx\n", hr );
 
     hr = WsResetError( error );