Fix a buffer overrun detected by coverity
Fix a buffer overrun detected by coverity

We were reading 32 bytes into a 17-byte buffer.  make the buffer big enough to
read the full 32 bytes
Author: Jonathon Jongsma

community-ssu/evolution-data-server,community-ssu/evolution-data-server,community-ssu/evolution-data-server,community-ssu/evolution-data-server,community-ssu/evolution-data-server,community-ssu/evolution-data-server,community-ssu/evolution-data-server,community-ssu/evolution-data-server,community-ssu/evolution-data-server,community-ssu/evolution-data-server,community-ssu/evolution-data-server