richedit: Missing HeapFree in WM_IME_COMPOSITION. (Smatch).

ME_InsertTextFromCursor copies the string passed into it rather than making
taking ownership of it.
diff --git a/dlls/riched20/editor.c b/dlls/riched20/editor.c
index 85e8f14..7764614 100644
--- a/dlls/riched20/editor.c
+++ b/dlls/riched20/editor.c
@@ -4268,6 +4268,7 @@
         ImmGetCompositionStringW(hIMC, GCS_RESULTSTR, lpCompStr, dwBufLen);
         lpCompStr[dwBufLen/sizeof(WCHAR)] = 0;
         ME_InsertTextFromCursor(editor,0,lpCompStr,dwBufLen/sizeof(WCHAR),style);
+        HeapFree(GetProcessHeap(), 0, lpCompStr);
     }
     else if (lParam & GCS_COMPSTR)
     {
@@ -4280,6 +4281,7 @@
         lpCompStr[dwBufLen/sizeof(WCHAR)] = 0;
 
         ME_InsertTextFromCursor(editor,0,lpCompStr,dwBufLen/sizeof(WCHAR),style);
+        HeapFree(GetProcessHeap(), 0, lpCompStr);
         ME_SetSelection(editor,editor->imeStartIndex,
                         editor->imeStartIndex + dwBufLen/sizeof(WCHAR));
     }