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vnc/devdraw: fix topnwindows() panic when images are not windows (thanks aiju)

see changeset 319be6cfe7ef

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

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

@@ -2029,13 +2029,13 @@

 				free(lp);

 				nexterror();

 			}

-			for(j=0; j<nw; j++)

+			for(j=0; j<nw; j++){

 				lp[j] = drawimage(client, a+1+1+2+j*4);

-			if(lp[0]->layer == 0)

-				error("images are not windows");

-			for(j=1; j<nw; j++)

+				if(lp[j]->layer == 0)

+					error("images are not windows");

 				if(lp[j]->layer->screen != lp[0]->layer->screen)

 					error("images not on same screen");

+			}

 			if(a[1])

 				memltofrontn(lp, nw);

 			else