catch exceptions as const

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ia4086e77ad205e9a6a73a6ca570036818e3069fe
diff --git a/src/selcommands.cpp b/src/selcommands.cpp
index ac68ace..aade561 100644
--- a/src/selcommands.cpp
+++ b/src/selcommands.cpp
@@ -61,12 +61,12 @@
             data.push_back(static_cast<uint8_t>(
                 std::stoul(hexStr.substr(i, 2), nullptr, 16)));
         }
-        catch (std::invalid_argument& e)
+        catch (const std::invalid_argument& e)
         {
             phosphor::logging::log<phosphor::logging::level::ERR>(e.what());
             return -1;
         }
-        catch (std::out_of_range& e)
+        catch (const std::out_of_range& e)
         {
             phosphor::logging::log<phosphor::logging::level::ERR>(e.what());
             return -1;