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libdraw: open file-descriptor with OCEXEC flag in readcolmap()

--- a/sys/src/libdraw/readcolmap.c

+++ b/sys/src/libdraw/readcolmap.c

@@ -27,8 +27,8 @@

 	USED(screen);

 	sprint(buf, "/dev/draw/%d/colormap", d->dirno);

-	b = Bopen(buf, OREAD);

-	if(b == 0)

+	b = Bopen(buf, OREAD|OCEXEC);

+	if(b == nil)

 		drawerror(d, "rdcolmap: can't open colormap device");

 	for(;;) {