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plan9: selset: fix out of range memset

--- a/plan9.c

+++ b/plan9.c

@@ -477,7 +477,7 @@

 	int y;

 	for (y = cury; y < cury+selh && y < field.height; y++)

-		memset(&field.buffer[curx + field.width*y], key, selw);

+		memset(&field.buffer[curx + field.width*y], key, MIN(field.width-curx, selw));

 }

 static void