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pc: use JMPF instead of indirect jump for going to syscall()

--- a/sys/src/9/pc/l.s

+++ b/sys/src/9/pc/l.s

@@ -1071,11 +1071,9 @@

 	MOVW	AX, DS

 	MOVW	AX, ES

-	MOVL	$syscall(SB), AX

-

 	PUSHL	SP			/* Ureg* argument to syscall */

 	PUSHL	$forkret(SB)		/* return pc */

-	JMP	*AX

+	JMPF	syscall(SB)

 TEXT vectortable(SB), $0

 	CALL _strayintr(SB); BYTE $0x00		/* divide error */

-- 

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