less: move code to count lines into a separate function

function                                             old     new   delta
update_num_lines                                       -     159    +159
m_status_print                                       409     266    -143
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/1 up/down: 159/-143)           Total: 16 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed