build: eliminate MSVC warning

8a0cc500 · Alexander Alekhin · 0ede1b5b · 8a0cc500
Commit 8a0cc500 authored Mar 22, 2018 by Alexander Alekhin
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filter.cpp modules/imgproc/src/filter.cpp +1 -0

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--- a/modules/imgproc/src/filter.cpp
+++ b/modules/imgproc/src/filter.cpp
@@ -4630,6 +4630,7 @@ static bool ippFilter2D(int stype, int dtype, int kernel_type,
    }
    catch(const ::ipp::IwException& ex)
    {
+        CV_UNUSED(ex);
        return false;
    }