Use correct type

In the main branch, the type of these fields was updated from 'int'
to 'rtapi_intptr_t'. On 64-bit systems, this led to most HAL
operations crashing.

Author: jepler

src/hal/hal_priv.h

@@ -162,21 +162,21 @@ class hal_shmfield {
     const T *operator ->() const { return get(); }
     operator bool() const { return off; }
 private:
-    int off;
+    rtapi_intptr_t off;
 };
 
 template<class T>
 hal_shmfield<T> hal_make_shmfield(T *t) {
     return hal_shmfield<T>(t);
 }
 
-static_assert(sizeof(hal_shmfield<void>) == sizeof(int), "hal_shmfield size matches");
+static_assert(sizeof(hal_shmfield<void>) == sizeof(rtapi_intptr_t), "hal_shmfield size matches");
 
 #define SHMFIELD(type) hal_shmfield<type>
 #define SHMPTR(arg) ((arg).get())
 #define SHMOFF(ptr) (hal_make_shmfield(ptr))
 #else
-#define SHMFIELD(type) int
+#define SHMFIELD(type) rtapi_intptr_t
 
 /* SHMPTR(offset) converts 'offset' to a void pointer. */
 #define SHMPTR(offset)  ( (void *)( hal_shmem_base + (offset) ) )