catch exceptions as const

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I6a2316d11f1dd70d8dc2368c2aa01d88cf1cdb26
diff --git a/libpldmresponder/bios_table.cpp b/libpldmresponder/bios_table.cpp
index a618f52..0524614 100644
--- a/libpldmresponder/bios_table.cpp
+++ b/libpldmresponder/bios_table.cpp
@@ -23,7 +23,7 @@
     {
         empty = fs::is_empty(filePath);
     }
-    catch (fs::filesystem_error& e)
+    catch (const fs::filesystem_error& e)
     {
         return true;
     }