Add missing port clause in memory.c

Adds a missing clause to handle port terms in `memory_estimate_usage(term)` function that is necessary
for formatting ports for io or other purposes.

Signed-off-by: Winford <winford@object.stream>

Author: UncleGrumpy

src/libAtomVM/memory.c

@@ -594,6 +594,10 @@ static void memory_scan_and_copy(HeapFragment *old_fragment, term *mem_start, co
             TRACE("Found PID (%" TERM_X_FMT ")\n", t);
             ptr++;
 
+        } else if (term_is_local_port(t)) {
+            TRACE("Found port (%" TERM_X_FMT ")\n", t);
+            ptr++;
+
         } else if ((t & 0x3) == 0x0) {
             TRACE("Found boxed header (%" TERM_X_FMT ")\n", t);