getty-generator: fix segfault when $container_ttys is not set

diff --git a/src/getty-generator/getty-generator.c b/src/getty-generator/getty-generator.c
index 36a93695fbd449e7ab63cd61604d5a1218cfaaec..feb58156ea1687409f9f81e68ac7d312dc102efb 100644 (file)
--- a/src/getty-generator/getty-generator.c
+++ b/src/getty-generator/getty-generator.c
@@ -130,7 +130,7 @@ int main(int argc, char *argv[]) {
                  * the variable name we only support ptys here. */
 
                 r = getenv_for_pid(1, "container_ttys", &container_ttys);
-                if (r >= 0) {
+                if (r > 0) {
                         char *w, *state;
                         size_t l;