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vncs: parse screenid as long, not short: BGSHORT() -> BGLONG()

--- a/sys/src/cmd/vnc/devdraw.c

+++ b/sys/src/cmd/vnc/devdraw.c

@@ -1349,7 +1349,7 @@

 			if(n < m)

 				error(Eshortdraw);

 			dstid = BGLONG(a+1);

-			scrnid = BGSHORT(a+5);

+			scrnid = BGLONG(a+5);

 			refresh = a[9];

 			chan = BGLONG(a+10);

 			repl = a[14];