Eliminate CSA false warning about null dereference in array_mark_proc

The exact warning message is: Access to field 'mse_start' results in a
dereference of a null pointer (loaded from variable 'new_mark_stack_ptr').

* typd_mlc.c (GC_array_mark_proc): Add assertion that mark_stack_ptr is
non-NULL (thus orig_mark_stack_ptr is non-NULL too).

1 files changed, 1 insertions, 0 deletions

diff --git a/typd_mlc.c b/typd_mlc.c
index 839c3144..8e92cda1 100644
--- a/typd_mlc.c
+++ b/typd_mlc.c
@@ -499,6 +499,7 @@ STATIC mse * GC_array_mark_proc(word * addr, mse * mark_stack_ptr,
         /* and request a mark stack expansion.                          */
         /* This cannot cause a mark stack overflow, since it replaces   */
         /* the original array entry.                                    */
+        GC_ASSERT(mark_stack_ptr != NULL);
         GC_mark_stack_too_small = TRUE;
         new_mark_stack_ptr = orig_mark_stack_ptr + 1;
         new_mark_stack_ptr -> mse_start = (ptr_t)addr;