mshtml: Fixed some leaks in tests (valgrind).

diff --git a/dlls/mshtml/tests/activex.c b/dlls/mshtml/tests/activex.c
index d3cbb9d..bf3e2e9a 100644
--- a/dlls/mshtml/tests/activex.c
+++ b/dlls/mshtml/tests/activex.c

@@ -471,6 +471,7 @@
     ok(hres == S_OK, "Read failed: %08x\n", hres);
     ok(V_VT(&v) == VT_BSTR, "V_VT(&v) = %d\n", V_VT(&v));
     ok(!strcmp_wa(V_BSTR(&v), "3"), "V_BSTR(v) = %s\n", wine_dbgstr_w(V_BSTR(&v)));
+    SysFreeString(V_BSTR(&v));
 
     V_VT(&v) = VT_I4;
     V_I4(&v) = 0xdeadbeef;

diff --git a/dlls/mshtml/tests/dom.c b/dlls/mshtml/tests/dom.c
index f753b14..c883a70 100644
--- a/dlls/mshtml/tests/dom.c
+++ b/dlls/mshtml/tests/dom.c

@@ -2909,6 +2909,7 @@
     hres = IHTMLDocument2_createElement(doc, tmp, &elem);
     ok_(__FILE__,line) (hres == S_OK, "createElement failed: %08x\n", hres);
     ok_(__FILE__,line) (elem != NULL, "elem == NULL\n");
+    SysFreeString(tmp);
 
     return elem;
 }
@@ -2927,6 +2928,7 @@
     tmp = a2bstr(text);
     hres = IHTMLDocument3_createTextNode(doc3, tmp, &node);
     IHTMLDocument3_Release(doc3);
+    SysFreeString(tmp);
     ok_(__FILE__,line) (hres == S_OK, "createElement failed: %08x\n", hres);
     ok_(__FILE__,line) (node != NULL, "node == NULL\n");
 

diff --git a/dlls/mshtml/tests/events.c b/dlls/mshtml/tests/events.c
index 7d69dd5..4be0212 100644
--- a/dlls/mshtml/tests/events.c
+++ b/dlls/mshtml/tests/events.c

@@ -986,6 +986,7 @@
     else
         ok(0, "unexpected state %s\n", wine_dbgstr_w(str));
 
+    SysFreeString(str);
     IHTMLDocument2_Release(iframe_doc);
     IHTMLFrameBase2_Release(iframe);
     return S_OK;