m2m-scaler: workaround: do not use get_system_memory call

get_system_memory was returning a tuncated pointer (for some unknown
reason). Try to access system_memory global variable direcly instead of
calling the get_system_memory function.

(gdb) p system_memory
$1 = (MemoryRegion *) 0x555556ae16e0
(gdb) p mr
$2 = (MemoryRegion *) 0x56ae16e0
(gdb)

hw/misc/m2m_scaler.c

@@ -23,7 +23,7 @@
 #include "stb_image_resize.h"
 
 //#define DEBUG_M2M_SCALER 1
-
+extern MemoryRegion *system_memory;
 #ifdef DEBUG_M2M_SCALER
 #define DPRINTF(fmt, ...) \
 do { printf("m2ms: " fmt , ## __VA_ARGS__); } while (0)
@@ -285,7 +285,7 @@ static void m2m_scaler_realize(DeviceState *dev, Error **errp) {
 
 
   /* HW can read and write into entire DDR */
-  address_space_init(&s->dma_as, get_system_memory(), "m2m-scaler-dma");
+  address_space_init(&s->dma_as, system_memory, "m2m-scaler-dma");
 
   s->stopping = false;
 

softmmu/physmem.c

@@ -85,7 +85,7 @@
  */
 RAMList ram_list = { .blocks = QLIST_HEAD_INITIALIZER(ram_list.blocks) };
 
-static MemoryRegion *system_memory;
+MemoryRegion *system_memory;
 static MemoryRegion *system_io;
 
 AddressSpace address_space_io;