catch exceptions as const

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ia8f2ae95679f98f2fc3f32239bbf3b3578c35888
diff --git a/procedures/phal/import_devtree.cpp b/procedures/phal/import_devtree.cpp
index 6d8adc4..d1cff3e 100644
--- a/procedures/phal/import_devtree.cpp
+++ b/procedures/phal/import_devtree.cpp
@@ -82,7 +82,7 @@
             fs::remove_all(path);
         }
     }
-    catch (fs::filesystem_error& e)
+    catch (const fs::filesystem_error& e)
     { // Log message and continue. Data already applied successfully.
         log<level::ERR>(fmt::format("File({}) delete failed Error:({})",
                                     DEVTREE_EXP_FILE, e.what())