xfs: stats are no longer dependent on CONFIG_PROC_FS

So we need to fix the makefile to understand this, otherwise build
errors with CONFIG_PROC_FS=n occur.
Reported-and-tested-by: Jim Davis <jim.epost@gmail.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/xfs/Makefile

@@ -84,6 +84,7 @@ xfs-y				+= xfs_aops.o \
 				   xfs_message.o \
 				   xfs_mount.o \
 				   xfs_mru_cache.o \
+				   xfs_stats.o \
 				   xfs_super.o \
 				   xfs_symlink.o \
 				   xfs_sysfs.o \
@@ -118,7 +119,6 @@ xfs-$(CONFIG_XFS_QUOTA)		+= xfs_dquot.o \
 xfs-$(CONFIG_XFS_RT)		+= xfs_rtalloc.o
 
 xfs-$(CONFIG_XFS_POSIX_ACL)	+= xfs_acl.o
-xfs-$(CONFIG_PROC_FS)		+= xfs_stats.o
 xfs-$(CONFIG_SYSCTL)		+= xfs_sysctl.o
 xfs-$(CONFIG_COMPAT)		+= xfs_ioctl32.o
 xfs-$(CONFIG_NFSD_PNFS)		+= xfs_pnfs.o

fs/xfs/xfs_stats.c

@@ -161,6 +161,7 @@ static const struct file_operations xqmstat_proc_fops = {
 };
 #endif /* CONFIG_XFS_QUOTA */
 
+#ifdef CONFIG_PROC_FS
 int
 xfs_init_procfs(void)
 {
@@ -191,3 +192,4 @@ xfs_cleanup_procfs(void)
 {
 	remove_proc_subtree("fs/xfs", NULL);
 }
+#endif /* CONFIG_PROC_FS */