remove max_datalen since it is used only once

[Claudio Jeker]

Subject sais it all. One less gloabl symbol.

-- 
:wq Claudio

Index: kern/uipc_domain.c
===================================================================
RCS file: /cvs/src/sys/kern/uipc_domain.c,v
retrieving revision 1.33
diff -u -p -r1.33 uipc_domain.c
--- kern/uipc_domain.c  20 Aug 2013 09:14:21 -0000      1.33
+++ kern/uipc_domain.c  12 Sep 2013 07:35:59 -0000
@@ -114,7 +114,6 @@ domaininit(void)
        if (max_linkhdr < 16)           /* XXX */
                max_linkhdr = 16;
        max_hdr = max_linkhdr + max_protohdr;
-       max_datalen = MHLEN - max_hdr;
        timeout_set(&pffast_timeout, pffasttimo, &pffast_timeout);
        timeout_set(&pfslow_timeout, pfslowtimo, &pfslow_timeout);
        timeout_add(&pffast_timeout, 1);
Index: kern/uipc_mbuf.c
===================================================================
RCS file: /cvs/src/sys/kern/uipc_mbuf.c,v
retrieving revision 1.177
diff -u -p -r1.177 uipc_mbuf.c
--- kern/uipc_mbuf.c    10 Jan 2014 00:47:17 -0000      1.177
+++ kern/uipc_mbuf.c    18 Jan 2014 03:39:10 -0000
@@ -118,7 +118,6 @@ int m_clpool(u_int);
 int max_linkhdr;               /* largest link-level header */
 int max_protohdr;              /* largest protocol header */
 int max_hdr;                   /* largest link+protocol header */
-int max_datalen;               /* MHLEN - max_hdr */
 
 struct timeout m_cltick_tmo;
 int    m_clticks;
Index: nfs/nfs_socket.c
===================================================================
RCS file: /cvs/src/sys/nfs/nfs_socket.c,v
retrieving revision 1.102
diff -u -p -r1.102 nfs_socket.c
--- nfs/nfs_socket.c    4 Jul 2013 20:05:55 -0000       1.102
+++ nfs/nfs_socket.c    10 Jul 2013 13:54:03 -0000
@@ -1058,7 +1058,7 @@ nfs_rephead(int siz, struct nfsrv_descri
         * try and leave leading space for the lower level headers.
         */
        siz += RPC_REPLYSIZ;
-       if (siz >= max_datalen) {
+       if (siz >= MHLEN - max_hdr) {
                MCLGET(mreq, M_WAIT);
        } else
                mreq->m_data += max_hdr;
Index: sys/mbuf.h
===================================================================
RCS file: /cvs/src/sys/sys/mbuf.h,v
retrieving revision 1.171
diff -u -p -r1.171 mbuf.h
--- sys/mbuf.h  11 Jan 2014 04:46:15 -0000      1.171
+++ sys/mbuf.h  18 Jan 2014 03:39:11 -0000
@@ -412,7 +412,6 @@ extern      int mcllowat;                   /* mbuf cluster 
l
 extern int max_linkhdr;                /* largest link-level header */
 extern int max_protohdr;               /* largest protocol header */
 extern int max_hdr;                    /* largest link+protocol header */
-extern int max_datalen;                /* MHLEN - max_hdr */
 
 void   mbinit(void);
 struct mbuf *m_copym2(struct mbuf *, int, int, int);