Silly error in buffer.c

[agricola]

This bug can manifest itself in a number of ways, essentially causing random crashes. It mainly happens when the OLC is used. Buffers of a particular length are not extended when they should be, causing much agony.

Line 126 of buffer.c should be changed from

if(to_replace * (b_len - a_len) + buf->len > buf->maxlen)

to

if(to_replace * (b_len - a_len) + buf->len >= buf->maxlen)

[agricola (agricola)]

An alternate/ancillary/complementary fix offered by Stendec was to change line 113 from:

int len_needed = buf->maxlen;

to

int len_needed = buf->maxlen + 1;