Fix FTBFS with GCC6

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 785a180341)

khexedit/lib/kbigbuffer.cpp

@@ -170,7 +170,7 @@ bool KBigBuffer::ensurePageLoaded( unsigned int PageIndex ) const
   if( NoOfFreePages < 1 )
   {
     // free the page which is the furthest away from the page we are loading
-    if( abs(FirstPage-PageIndex) > abs(LastPage-PageIndex) )
+    if( labs(FirstPage-PageIndex) > labs(LastPage-PageIndex) )
       while( !freePage(FirstPage++) );
     else
       while( !freePage(LastPage--) );

kregexpeditor/regexpconverter.cpp

@@ -33,7 +33,9 @@
 RegExpConverter* RegExpConverter::_current = 0;
 RegExp* RegExpConverter::parse( const TQString&, bool* ok )
 {
-    ok = false;
+    if(ok) {
+        *ok = false;
+    }
     return new DotRegExp( false ); // This method should never be called.
 }