kernel/vm: Put the address space in get_memory_map_etc.

We don't need a lock here (as we just want the TranslationMap),
but we do need to release the reference we acquired when finished,
otherwise the address space will be leaked.

src/system/kernel/vm/vm.cpp

@@ -5640,6 +5640,7 @@ get_memory_map_etc(team_id team, const void* address, size_t numBytes,
 	if (addressSpace == NULL)
 		return B_ERROR;
 
+	VMAddressSpacePutter addressSpacePutter(addressSpace);
 
 	VMTranslationMap* map = addressSpace->TranslationMap();
 	if (interrupts)