Fix leftover

Author: patacca

src/bindiff/bindiff.py

@@ -110,8 +110,8 @@ def secondary_unmatched_function(self) -> list[FunctionBinExport]:
         :return: list of unmatched functions in secondary
         """
         funs = []
-        for fun_addr, fun in self.primary.items():
-            if fun_addr not in self.primary_functions_match:
+        for fun_addr, fun in self.secondary.items():
+            if fun_addr not in self.secondary_functions_match:
                 funs.append(fun)
         return funs