Empty line in log file causes event corruption

[QMay]

When a log file contains an empty line (regex: '^$') log-courier message lines become corrupted. Symptoms include messages beginning with '\n' or if using the multiline codec this can cause an anchored RegEx to fail.

The error is in 'linereader.go' line 59:

if n := bytes.IndexByte(lr.buf[lr.start:lr.end], '\n'); n > 0 {

should be:

if n := bytes.IndexByte(lr.buf[lr.start:lr.end], '\n'); n >= 0 {

'>' should be '>='

[driskell]

Quite right! I'll push a fix in a minute or two.