[GFS2] Remove pointless argument relating to truncate

For some reason a function pointer was being passed through
the truncate code which only ever took one value. This removes
the function pointer and replaces it with a single call to
the function in question.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/ops_inode.c

@@ -994,7 +994,7 @@ static int setattr_size(struct inode *inode, struct iattr *attr)
 			return error;
 	}
 
-	error = gfs2_truncatei(ip, attr->ia_size, gfs2_truncator_page);
+	error = gfs2_truncatei(ip, attr->ia_size);
 	if (error)
 		return error;