svlogd: do not overrun read buffer (fixes bug 439)

function                                             old     new   delta
rotate                                               513     534     +21
logdirs_reopen                                      1291    1296      +5
processorstart                                       409     385     -24

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