util/ralloc: Don't define assert with magic member without DEBUG

It is possible to have DEBUG disabled but asserts on (NDEBUG), which
cannot build because these asserts work on members that are only present
when DEBUG is on.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>

src/util/ralloc.c

@@ -630,7 +630,9 @@ linear_alloc_child(void *parent, unsigned size)
    linear_size_chunk *ptr;
    unsigned full_size;
 
+#ifdef DEBUG
    assert(first->magic == LMAGIC);
+#endif
    assert(!latest->next);
 
    size = ALIGN_POT(size, SUBALLOC_ALIGNMENT);
@@ -702,7 +704,9 @@ linear_free_parent(void *ptr)
       return;
 
    node = LINEAR_PARENT_TO_HEADER(ptr);
+#ifdef DEBUG
    assert(node->magic == LMAGIC);
+#endif
 
    while (node) {
       void *ptr = node;
@@ -721,7 +725,9 @@ ralloc_steal_linear_parent(void *new_ralloc_ctx, void *ptr)
       return;
 
    node = LINEAR_PARENT_TO_HEADER(ptr);
+#ifdef DEBUG
    assert(node->magic == LMAGIC);
+#endif
 
    while (node) {
       ralloc_steal(new_ralloc_ctx, node);
@@ -734,7 +740,9 @@ void *
 ralloc_parent_of_linear_parent(void *ptr)
 {
    linear_header *node = LINEAR_PARENT_TO_HEADER(ptr);
+#ifdef DEBUG
    assert(node->magic == LMAGIC);
+#endif
    return node->ralloc_parent;
 }