[LTP] [PATCH v4 1/5] lib: Ignore empty LTP_ENABLE_DEBUG

[Petr Vorel]

Empty LTP_ENABLE_DEBUG environment variable should be just ignored.

This fixes warning:
LTP_ENABLE_DEBUG= ./test05
tst_test.c:1454: TWARN: Invalid LTP_ENABLE_DEBUG value:

Fixes: e434de62b4 ("lib: Extend LTP_ENABLE_DEBUG to support verbosity levels")
Reviewed-by: Li Wang <liwang@redhat.com>
Reviewed-by: Andrea Cervesato <andrea.cervesato@suse.com>
Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
 lib/tst_test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/tst_test.c b/lib/tst_test.c
index 26f6510a0a..229da669fa 100644
--- a/lib/tst_test.c
+++ b/lib/tst_test.c
@@ -1445,13 +1445,13 @@ static void do_setup(int argc, char *argv[])
 
 	parse_opts(argc, argv);
 
-	if (tdebug_env && !context->tdebug) {
+	if (tdebug_env && *tdebug_env && !context->tdebug) {
 		if (!strcmp(tdebug_env, "2"))
 			context->tdebug = 2;
 		else if (!strcmp(tdebug_env, "1") || !strcmp(tdebug_env, "y"))
 			context->tdebug = 1;
 		else
-			tst_res(TWARN, "Invalid LTP_ENABLE_DEBUG value: %s", tdebug_env);
+			tst_res(TWARN, "Invalid LTP_ENABLE_DEBUG value: '%s'", tdebug_env);
 
 		if (context->tdebug)
 			tst_res(TINFO, "Enabling debug info (level %d)", context->tdebug);
-- 
2.53.0