apps/wpa_supplicant: fix 'boolean expression is always false'
apps/wpa_supplicant: fix 'boolean expression is always false'

Fixed an error that can be found when using the latest toolchain.

src/utils/os_tinyara.c: In function 'os_daemon':
src/utils/os_tinyara.c:158:39: error: comparison of constant '0' with
boolean expression is always false [-Werror=bool-compare]
  if (((nochdir == 0) && (chdir("/"))) < 0) {
                                       ^

Change-Id: I42310e8c3543622b02433f3f5b367d9d9020897c
Signed-off-by: Junhwan Park <7fee488b6f78fc50b291ffc7d10428788977e877@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT