Catch std::exception instead of armnn::Exception

Signed-off-by: Derek Lamberti <derek.lamberti@arm.com>
Signed-off-by: Kevin May <kevin.may@arm.com>
Change-Id: I054635ebfd52cb5575490c3bfaae0104eb1685cc
diff --git a/ConversionUtils.hpp b/ConversionUtils.hpp
index fabf189..b695aa6 100644
--- a/ConversionUtils.hpp
+++ b/ConversionUtils.hpp
@@ -1800,7 +1800,7 @@
         concatDescriptor =
                 armnn::CreateDescriptorForConcatenation(inputShapes.begin(), inputShapes.end(), concatDim);
     }
-    catch (const armnn::Exception& error)
+    catch (std::exception& error)
     {
         return Fail("%s: Error preparing concat descriptor. %s", __func__, error.what());
     }