tests: iterator::workdir: fix GCC warning

Since GCC 8.1, the compiler performs some bounds checking when
copying static data into arrays with a known size. In one test,
we print a format string of "%s/sub%02d" into a buffer of 64
bytes. The input buffer for the first "%s" is bounded to at most
63 characters, plus four bytes for the static string "/sub" plus
two more bytes for "%02d". Thus, our target buffer needs to be at
least 70 bytes in size, including the NUL byte. There seems to be
a bug in the analysis, though, because GCC will not account for
the limiting "%02" prefix, treating it as requiring the same
count of bytes as a "%d".

Thus, we end up at 79 bytes that are required to fix the
warning. To make it look nicer and less special, we just round
the buffer size up to 80 bytes.

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/iterator/workdir.c b/tests/iterator/workdir.c
index 81016752c..c38a6152b 100644
--- a/tests/iterator/workdir.c
+++ b/tests/iterator/workdir.c
@@ -460,7 +460,7 @@ void test_iterator_workdir__icase_starts_and_ends(void)
 static void build_workdir_tree(const char *root, int dirs, int subs)
 {
 	int i, j;
-	char buf[64], sub[64];
+	char buf[64], sub[80];
 
 	for (i = 0; i < dirs; ++i) {
 		if (i % 2 == 0) {