--- xinu/sys/freemem.c	2018/04/24 17:39:04	1.1.1.1
+++ xinu/sys/freemem.c	2018/04/24 17:40:12	1.1.1.2
@@ -12,25 +12,25 @@ SYSCALL	freemem(block, size)
 	struct	mblock	*block;
 	unsigned size;
 {
-	PStype	ps;
 	struct	mblock	*p, *q;
 	unsigned top;
 
 	if (size==0 || (unsigned)block>(unsigned)maxaddr
-		    || ((unsigned)block)<((unsigned)&end))
+	    || ((unsigned)block)<((unsigned)&end))
 		return(SYSERR);
 	size = (unsigned)roundew(size);
-	disable(ps);
-	for( p=memlist.mnext,q= &memlist ; (char *)p!=NULL && p<block ;
-		    q=p,p=p->mnext )
+	disable();
+	for( p=memlist.mnext,q= &memlist;
+	     p != (struct mblock *) NULL && p < block ;
+	     q=p,p=p->mnext )
 		;
 	if ((top=q->mlen+(unsigned)q)>(unsigned)block && q!= &memlist ||
-		    (char *)p!=NULL && (size+(unsigned)block) > (unsigned)p ) {
-		restore(ps);
+	    p!=NULL && (size+(unsigned)block) > (unsigned)p ) {
+		restore();
 		return(SYSERR);
 	}
 	if ( q!= &memlist && top == (unsigned)block )
-		q->mlen += size;
+			q->mlen += size;
 	else {
 		block->mlen = size;
 		block->mnext = p;
@@ -41,6 +41,6 @@ SYSCALL	freemem(block, size)
 		q->mlen += p->mlen;
 		q->mnext = p->mnext;
 	}
-	restore(ps);
+	restore();
 	return(OK);
 }