staging: lustre: silence a static checker warning

Static checkers warn that if  cfs_cpt_table_print() returns an error
other than -EFBIG, then it would lead to a double free.  This is true
but cfs_cpt_table_print() only returns -EFBIG on error so it also won't
happen in real life.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/libcfs/linux/linux-proc.c

@@ -365,8 +365,8 @@ static int __proc_cpt_table(void *data, int write,
 		if (rc >= 0)
 			break;
 
-		LIBCFS_FREE(buf, len);
 		if (rc == -EFBIG) {
+			LIBCFS_FREE(buf, len);
 			len <<= 1;
 			continue;
 		}