[LyX/master] Initialize member

[Georg Baum]

commit 8a6fad9cea70a6fb02c7129dbcd7527cd9a8af71
Author: Georg Baum <b...@lyx.org>
Date:   Fri Oct 9 23:15:54 2015 +0200

    Initialize member
    
    This fixes the crash of bug #9788. However, the misparsing of \multicolumn
    is still there: LyX thinks that the array has three columns, it inserts an
    additional one before the multicolumn.

diff --git a/src/mathed/InsetMathGrid.cpp b/src/mathed/InsetMathGrid.cpp
index 7fc7737..ae32558 100644
--- a/src/mathed/InsetMathGrid.cpp
+++ b/src/mathed/InsetMathGrid.cpp
@@ -106,7 +106,7 @@ int InsetMathGrid::RowInfo::skipPixels(MetricsInfo const & 
mi) const
 
 
 InsetMathGrid::ColInfo::ColInfo()
-       : align_('c'), lines_(0)
+       : align_('c'), lines_(0), skip_(0)
 {}