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zynq: make screen and cursor kprocs exit properly

--- a/sys/src/9/zynq/screen.c

+++ b/sys/src/9/zynq/screen.c

@@ -124,7 +124,7 @@

 	if(waserror()){

 		hwcursor.addr = 0;

 		hwcursor.proc = nil;

-		return;

+		pexit("detached", 1);

 	}

 	reg = (u32int*)hwcursor.addr;

@@ -204,7 +204,7 @@

 	if(waserror()){

 		fbscreen.addr = 0;

 		fbscreen.proc = nil;

-		return;

+		pexit("detached", 1);

 	}

 	for(;;){