Fix -data-info-line when source includes column number.

This fixes an off-by-one bug in CMICmdCmdDataInfoLine::Acknowledge.  Given:
    LineEntry: \[0x0000000100000f37-0x0000000100000f45\): /path/to/file:123:1
-data-info-line would report the line as 12, omitting the last digit.

Reviewed by: ki.stfu, abidh
Subscribers: lldb-commits
Differential Revision: http://reviews.llvm.org/D11209

llvm-svn: 242306