syntax typo fix

Author: gpshead

Lib/test/libregrtest/main.py

@@ -649,7 +649,7 @@ def adjust_resource_limits(self):
                 print(f"Raised RLIMIT_NOFILE to {new_fd_limit}.")
             except (ValueError, OSError) as err:
                 print(f"Unable to raise RLIMIT_NOFILE from {fd_limit} to "
-                      f"{new_fd_limit}: {err}".)
+                      f"{new_fd_limit}: {err}.")
 
     def main(self, tests=None, **kwargs):
         self.parse_args(kwargs)