[LTP] [PATCH 1/1] tst_test.sh: Fix check for $TST_DEVICE

[Petr Vorel]

When tst_device acquire call fails, it outputs into stdout,
therefore the content is actually help message.
=> Check for file presence rather than variable not being empty.

Fixes: c5ac5d712 tst_test.sh: Make use of tst_device helper

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
Hi,

other option would be to check $?.

BTW found while testing on TMPDIR being tmpfs with small size (300M).
Test lib/newlib_tests/tst_device.c obviously fails.

Kind regards,
Petr
---
 testcases/lib/tst_test.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/lib/tst_test.sh b/testcases/lib/tst_test.sh
index d27b4afd6..799045b03 100644
--- a/testcases/lib/tst_test.sh
+++ b/testcases/lib/tst_test.sh
@@ -364,7 +364,7 @@ tst_run()
 
 		TST_DEVICE=$(tst_device acquire)
 
-		if [ -z "$TST_DEVICE" ]; then
+		if [ ! -b "$TST_DEVICE" ]; then
 			tst_brk TBROK "Failed to acquire device"
 		fi
 
-- 
2.17.1