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kernel: handle memimageinit() error

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

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

@@ -48,7 +48,8 @@

 		nexterror();

 	}

-	memimageinit();

+	if(memimageinit() < 0)

+		error("memimageinit failed");

 	lock(&vgascreenlock);

 	if(waserror()){