Update pythonbpf/functions_pass.py

Co-authored-by: Copilot <[email protected]>

Author: r41k0u

pythonbpf/functions_pass.py

@@ -674,7 +674,7 @@ def _expr_type(e):
             if found_type is None:
                 found_type = t
             elif found_type != t:
-                raise ValueError(f"Conflicting return types:{found_type} vs {t}")
+                raise ValueError(f"Conflicting return types: {found_type} vs {t}")
     return found_type or "None"