osl: Fix possible memleak

Change-Id: I162993df6b802bd51e4e079b3dc530476b220e4e
Reviewed-on: https://gerrit.libreoffice.org/52325Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

sal/osl/w32/profile.cxx

@@ -2106,6 +2106,7 @@ static bool lookupProfile(const sal_Unicode *strPath, const sal_Unicode *strFile
     {
         if ((nPos = rtl_ustr_lastIndexOfChar(strExecutable->buffer, L':')) == -1)
         {
+            rtl_uString_release(strExecutable);
             return false;
         }
         else