remove leet spelling of kzero from l32p.s

Reference: /n/atom/patch/applied2013/kzer0
Date: Wed Jul 31 00:41:56 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/l32p.s	Wed Jul 31 00:41:23 2013
+++ /sys/src/nix/k10/l32p.s	Wed Jul 31 00:41:24 2013
@@ -65,9 +65,9 @@
  * to paging mode. There's an assumption here that the creation and later
  * removal of the identity map will not interfere with the KZERO mappings;
  * the conditions for clearing the identity map are
- *	clear PML4 entry when (KZER0 & 0x0000ff8000000000) != 0;
- *	clear PDP entry when (KZER0 & 0x0000007fc0000000) != 0;
- *	don't clear PD entry when (KZER0 & 0x000000003fe00000) == 0;
+ *	clear PML4 entry when (KZERO & 0x0000ff8000000000) != 0;
+ *	clear PDP entry when (KZERO & 0x0000007fc0000000) != 0;
+ *	don't clear PD entry when (KZERO & 0x000000003fe00000) == 0;
  * the code below assumes these conditions are met.
  *
  * Assume a recent processor with Page Size Extensions
@@ -201,12 +201,12 @@
 	MOVQ	DX, PML4O(0)(AX) 		/* zap identity map PML4E */
 _zap0pdp:
 	ADDQ	$PTSZ, AX			/* PDP at PML4 + PTSZ */
-	CMPQ	DX, $PDPO(KZERO)		/* KZER0 & 0x0000007fc0000000 */
+	CMPQ	DX, $PDPO(KZERO)		/* KZERO & 0x0000007fc0000000 */
 	JEQ	_zap0pd
 	MOVQ	DX, PDPO(0)(AX)			/* zap identity map PDPE */
 _zap0pd:
 	ADDQ	$PTSZ, AX			/* PD at PML4 + 2*PTSZ */
-	CMPQ	DX, $PDO(KZERO)			/* KZER0 & 0x000000003fe00000 */
+	CMPQ	DX, $PDO(KZERO)			/* KZERO & 0x000000003fe00000 */
 	JEQ	_zap0done
 	MOVQ	DX, PDO(0)(AX)			/* zap identity map PDE */
 _zap0done: