Don't use reghp

mach/pmds4/libsys/sbrk.s

@@ -10,7 +10,7 @@
 _sbrk:		tst.b	-8(sp)
 			move.l	4(sp),d0
 			beq	1f
-			add.l	.reghp,d0
+			add.l	nd,d0
 			move.l	d0,-(sp)
 			clr.l	-(sp)
 			trap #0
@@ -19,15 +19,19 @@ _sbrk:		tst.b	-8(sp)
 			bcc	1f
 			jmp	cerror
 1:
-			move.l	.reghp,d0
+			move.l	nd,d0
 			move.l	4(sp),d1
-			add.l	d1,.reghp
+			add.l	d1,nd
 			rts
 _brk:			trap #0
 .data2	0x11
 			bcc	1f
 			jmp	cerror
 1:
-			move.l	4(sp),.reghp
+			move.l	4(sp),nd
 			clr.l	d0
 			rts
+.sect .data
+nd:
+	.data4 endbss
+.sect .text