[LTP] [PATCH] [syscalls] mbind01: fix compile

[Caspar Z. <cz...@re...>]

a typo fix, forgot NULL in tst_brkm. And seems tst_resm+tst_exit could
be replaced by tst_brkm().

Signed-off-by: Caspar Zhang <cz...@re...>
---
 testcases/kernel/mem/mbind/mbind01.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)