Fix an off by one error when handling a packet where our read buffer size truncates the first chunk of the packet 
between the two chars representing the checksum.

<rdar://problem/11882074>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@160310 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed