cov: check _insert_dev return value

Although we try later to validate device was inserted,
we can validate return value and early-exit.

diff --git a/lib/device/dev-cache.c b/lib/device/dev-cache.c
index aa93b575879954f9902a098be28bf1dfe906cade..dddf84e4d407fe035cc1127c52194fa343d7cedf 100644 (file)
--- a/lib/device/dev-cache.c
+++ b/lib/device/dev-cache.c
@@ -1510,7 +1510,8 @@ struct device *dev_cache_get(struct cmd_context *cmd, const char *name, struct d
         * for st_rdev.
         */
        if (!dev) {
-               _insert_dev(name, st.st_rdev);
+               if (!_insert_dev(name, st.st_rdev))
+                       return_NULL;
 
                /* Get the struct dev that was just added. */
                dev = (struct device *) dm_hash_lookup(_cache.names, name);