vcs-svn: drop no-op reset methods

Since v1.7.5~42^2~6 (vcs-svn: remove buffer_read_string)
buffer_reset() does nothing thus fast_export_reset() also.

Signed-off-by: David Barr <davidbarr@google.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>

test-line-buffer.c

@@ -87,6 +87,5 @@ int main(int argc, char *argv[])
 		die("input error");
 	if (ferror(stdout))
 		die("output error");
-	buffer_reset(&stdin_buf);
 	return 0;
 }