vi: code shrink

vi: code shrink

function                                             old     new   delta
status_line_bold_errno                                 -      32     +32
colon                                               2891    2873     -18
file_insert                                          354     313     -41
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/2 up/down: 32/-59)            Total: -27 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>