difftool: remove an unnecessary call to strbuf_release()

The `buf` strbuf is reused again later in the same function, so there
is no benefit to calling strbuf_release(). The subsequent usage is
already using strbuf_reset() to reset the buffer, so releasing it
early is only going to lead to a wasteful reallocation.

Remove the early call to strbuf_release(). The same strbuf is already
cleaned up in the "finish:" section so nothing is leaked, either.

Signed-off-by: David Aguilar <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: davvid

builtin/difftool.c

@@ -568,8 +568,6 @@ static int run_dir_diff(const char *extcmd, int symlinks, const char *prefix,
 		write_standin_files(entry, &ldir, ldir_len, &rdir, rdir_len);
 	}
 
-	strbuf_release(&buf);
-
 	strbuf_setlen(&ldir, ldir_len);
 	helper_argv[1] = ldir.buf;
 	strbuf_setlen(&rdir, rdir_len);