Fix crash by using texture in black square
authorH.G.Muller <hgm@hgm-xboard.(none)>
Fri, 9 Feb 2018 16:11:27 +0000 (17:11 +0100)
committerH.G.Muller <hgm@hgm-xboard.(none)>
Fri, 9 Feb 2018 16:11:27 +0000 (17:11 +0100)
commite1b40d86901fa0cce2568df412f657ad6bcbd1c2
tree8d4f721673e347dd64b024d724b65eedb9cf9201
parentb8388c391e8999c30c520672f08cca3b16f0f1da
Fix crash by using texture in black square

When BlankSquare was called with square_color = 2 to black out a square
(as when drawing holdings), it tried to use a non-existent texture bitmap
for this when background textures were on, risking a segfault in Cairo.
draw.c