6141 use kmem_zalloc instead of kmem_alloc + bzero/memset

*** 21,32 ****
  /*
   * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  #include <sys/param.h>
  #include <sys/t_lock.h>
  #include <sys/errno.h>
  #include <sys/sysmacros.h>
  #include <sys/buf.h>
--- 21,30 ----
*** 138,149 ****
          }
          /*
           * Cannot find node in active list. Allocate memory for a new node
           * initialize it, and put it on the active list.
           */
!         pcp = kmem_alloc(sizeof (struct pcnode), KM_SLEEP);
!         bzero(pcp, sizeof (struct pcnode));
          vp = vn_alloc(KM_SLEEP);
          pcp->pc_vn = vp;
          pcp->pc_entry = *ep;
          pcp->pc_eblkno = blkno;
          pcp->pc_eoffset = offset;
--- 136,146 ----
          }
          /*
           * Cannot find node in active list. Allocate memory for a new node
           * initialize it, and put it on the active list.
           */
!         pcp = kmem_zalloc(sizeof (struct pcnode), KM_SLEEP);
          vp = vn_alloc(KM_SLEEP);
          pcp->pc_vn = vp;
          pcp->pc_entry = *ep;
          pcp->pc_eblkno = blkno;
          pcp->pc_eoffset = offset;