ffs_vnops.c changes break kernels w/o WAPBL

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

Recent changes to "sys/ufs/ffs/ffs_vnops.c" break building kernels which
don't include "options WAPBL" (e.g. NET4501).

The complaint is about "struct mount *mp" being set but not used.

In the above-mentioned file in "ffs_spec_fsync(void *v)", "struct mount *mp"
is used only in a block of code guarded with "#ifdef WAPBL".

The following patch adds the same guard to the declaration and setting
of "struct mount *mp".  This allows the NET4501 kernel to build.

+Index: sys/ufs/ffs/ffs_vnops.c
+===================================================================
+RCS file: /cvsroot/src/sys/ufs/ffs/ffs_vnops.c,v
+retrieving revision 1.126
+diff -u -p -r1.126 ffs_vnops.c
+--- sys/ufs/ffs/ffs_vnops.c	1 Mar 2017 10:42:45 -0000	1.126
++++ sys/ufs/ffs/ffs_vnops.c	1 Mar 2017 20:10:33 -0000
+@@ -283,12 +283,16 @@ ffs_spec_fsync(void *v)
+ 	} */ *ap = v;
+ 	int error, flags, uflags;
+ 	struct vnode *vp;
++#ifdef WAPBL
+ 	struct mount *mp;
++#endif /* WAPBL */
+ 
+ 	flags = ap->a_flags;
+ 	uflags = UPDATE_CLOSE | ((flags & FSYNC_WAIT) ? UPDATE_WAIT : 0);
+ 	vp = ap->a_vp;
++#ifdef WAPBL
+ 	mp = vp->v_mount;
++#endif /* WAPBL */
+ 
+ 	error = spec_fsync(v);
+ 	if (error)

-- 
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