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games/gb: correctly mark transmitted serial data as sent

--- a/sys/src/games/gb/serial.c

+++ b/sys/src/games/gb/serial.c

@@ -100,6 +100,8 @@

 	assert(theirs.c != Cgone);

 	if(theirs.c == Csync)

 		return;

+	if(leader)

+		mine.c = Cgone;

 	reg[SB] = theirs.b;

 	reg[SC] &= ~0x80;