cc_array and cc_ring_array NULL fixes (twitter#201)

* cc_array fix NULL pointer check

* cc_ring_array fix NULL dereference

- log_verb() would result with segfault if arr=NULL

src/cc_array.c

@@ -74,7 +74,7 @@ array_create(struct array **arr, uint32_t nalloc, size_t size)
     ASSERT(nalloc != 0 && size != 0);
 
     *arr = (struct array *)cc_alloc(sizeof(**arr));
-    if (arr == NULL) {
+    if (*arr == NULL) {
         log_info("array creation failed due to OOM");
 
         return CC_ENOMEM;

src/cc_ring_array.c

@@ -172,13 +172,13 @@ ring_array_create(size_t elem_size, uint32_t cap)
 void
 ring_array_destroy(struct ring_array **arr)
 {
-    log_verb("destroying ring array %p and freeing memory", *arr);
-
     if ((arr == NULL) || (*arr == NULL)) {
         log_warn("destroying NULL ring_array pointer");
         return;
     }
 
+    log_verb("destroying ring array %p and freeing memory", *arr);
+
     cc_free(*arr);
     *arr = NULL;
 }