catch exceptions as const

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Id4f88568c2897ab1117dcad647783a9127c0600d
diff --git a/core_manager_main.cpp b/core_manager_main.cpp
index 3e0e459..7294cb2 100644
--- a/core_manager_main.cpp
+++ b/core_manager_main.cpp
@@ -45,7 +45,7 @@
         }
     }
 
-    catch (InternalFailure& e)
+    catch (const InternalFailure& e)
     {
         commit<InternalFailure>();
         return -1;