fix missing return statement

...introduced in my commit dc00ad1e
"fdo#46808, Use service constructor for task::InteractionHandler"

Change-Id: I187702ee5d6c3e653ce08526bb1af80af0b92cb4

sfx2/source/dialog/filedlghelper.cxx

@@ -2749,6 +2749,7 @@ ErrCode RequestPassword(const SfxFilter* pCurrentFilter, rtl::OUString& aURL, Sf
     }
     else
         return ERRCODE_ABORT;
+    return ERRCODE_NONE;
 }
 
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