Fix port_realloc to return moved pointer

(there were no uses of port_realloc to fix)

Author: jepler

ports/espressif/supervisor/port.c

@@ -336,8 +336,8 @@ void port_free(void *ptr) {
     heap_caps_free(ptr);
 }
 
-void port_realloc(void *ptr, size_t size) {
-    heap_caps_realloc(ptr, size, MALLOC_CAP_8BIT);
+void *port_realloc(void *ptr, size_t size) {
+    return heap_caps_realloc(ptr, size, MALLOC_CAP_8BIT);
 }
 
 size_t port_heap_get_largest_free_size(void) {

supervisor/port_heap.h

@@ -44,6 +44,6 @@ void *port_malloc(size_t size, bool dma_capable);
 
 void port_free(void *ptr);
 
-void port_realloc(void *ptr, size_t size);
+void *port_realloc(void *ptr, size_t size);
 
 size_t port_heap_get_largest_free_size(void);

supervisor/shared/port.c

@@ -62,8 +62,8 @@ MP_WEAK void port_free(void *ptr) {
     tlsf_free(heap, ptr);
 }
 
-MP_WEAK void port_realloc(void *ptr, size_t size) {
-    tlsf_realloc(heap, ptr, size);
+MP_WEAK void *port_realloc(void *ptr, size_t size) {
+    return tlsf_realloc(heap, ptr, size);
 }
 
 static void max_size_walker(void *ptr, size_t size, int used, void *user) {