Use with-current-buffer.

Use with-current-buffer.
(flymake-float-time, flymake-get-temp-dir, flymake-replace-regexp-in-string)
(flymake-line-beginning-position, flymake-current-row, flymake-selected-frame)
(flymake-line-end-position, flymake-popup-menu): Avoid testing for `xemacs'.
(flymake-nop): Move.
(flymake-region-has-flymake-overlays): Return the computed value.
(flymake-reformat-err-line-patterns-from-compile-el): Use dolist.
Remove unused var `endline'.
(flymake-get-line-count): Remove unused function.
(flymake-display-err-menu-for-current-line): Unused var `move-mouse-pos'.