reiserfsprogs: convert reiserfs_filsys_t from structure to pointer-to-structure

This makes it more consistent with e2fsprogs.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>

resize_reiserfs/resize.h

@@ -44,4 +44,4 @@ extern int opt_safe;
 extern int resize_fs_online(char *devname, long long int blocks);
 
 /* do_shrink.c */
-extern int shrink_fs(reiserfs_filsys_t *, long long int blocks);
+extern int shrink_fs(reiserfs_filsys_t , long long int blocks);