fix offset

Author: InvincibleRMC

mypy/stubdoc.py

@@ -273,9 +273,8 @@ def add_token(self, token: tokenize.TokenInfo) -> None:
                         self.reset()
                         return
                     self.keyword_only = len(self.args)
-                    self.keyword_only_index = (
-                        self.keyword_only + 1 if self.pos_only is not None else 0
-                    )
+                    pos_offset = 1 if self.pos_only is not None else 0
+                    self.keyword_only_index = self.keyword_only + pos_offset
                     self.accumulator = ""
                 else:
                     if self.accumulator.startswith("*"):