st/xlib: Add assert to check for null pointer dereference.
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@ -1148,6 +1148,7 @@ void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
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if (!surf_front || !surf_back)
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return;
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assert(pipe);
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pipe->surface_copy(pipe,
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surf_front, x, y, /* dest */
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surf_back, x, y, /* src */
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