Fix setting size of DEVDAX from environment

Fix setting size of DEVDAX from environment.
It fixes the Coverity issue no. 469373 and 469374.

Signed-off-by: Lukasz Dorau <[email protected]>

Author: ldorau

test/ipc_devdax_prov_consumer.c

@@ -36,7 +36,9 @@ int main(int argc, char *argv[]) {
     umf_devdax_memory_provider_params_t devdax_params =
         umfDevDaxMemoryProviderParamsDefault(
             getenv("UMF_TESTS_DEVDAX_PATH"),
-            atol(getenv("UMF_TESTS_DEVDAX_SIZE")));
+            atol(getenv("UMF_TESTS_DEVDAX_SIZE")
+                     ? getenv("UMF_TESTS_DEVDAX_SIZE")
+                     : "0"));
 
     return run_consumer(port, umfDevDaxMemoryProviderOps(), &devdax_params,
                         memcopy, NULL);

test/ipc_devdax_prov_producer.c

@@ -36,7 +36,9 @@ int main(int argc, char *argv[]) {
     umf_devdax_memory_provider_params_t devdax_params =
         umfDevDaxMemoryProviderParamsDefault(
             getenv("UMF_TESTS_DEVDAX_PATH"),
-            atol(getenv("UMF_TESTS_DEVDAX_SIZE")));
+            atol(getenv("UMF_TESTS_DEVDAX_SIZE")
+                     ? getenv("UMF_TESTS_DEVDAX_SIZE")
+                     : "0"));
 
     return run_producer(port, umfDevDaxMemoryProviderOps(), &devdax_params,
                         memcopy, NULL);