Fix TRACKER issues

Signed-off-by: Lukasz Dorau <[email protected]>

Author: ldorau

src/libumf_linux.c

@@ -19,7 +19,9 @@ void __attribute__((constructor)) umfCreate(void) {
 }
 
 void __attribute__((destructor)) umfDestroy(void) {
-    umfMemoryTrackerDestroy(TRACKER);
+    umf_memory_tracker_handle_t t = TRACKER;
+    TRACKER = NULL;
+    umfMemoryTrackerDestroy(t);
 }
 
 void libumfInit(void) {

src/provider/provider_tracking.c

@@ -80,6 +80,9 @@ static umf_result_t umfMemoryTrackerRemove(umf_memory_tracker_handle_t hTracker,
 
 umf_memory_pool_handle_t umfMemoryTrackerGetPool(const void *ptr) {
     assert(ptr);
+    if (TRACKER == NULL) {
+        return NULL;
+    }
 
     uintptr_t rkey;
     tracker_value_t *rvalue;