Fixed|libcommon|64-bit: Crash when binding controls in menu

Fixed passing of the symbolic event string pointer in the event_t
structure. Reassembly of the 64-bit pointer failed if ev->data1
was negative in its 32-bit integer range.

Todo for later: It isn't a great idea to pass 64-bit pointers like
this, why not just add a pointer member to event_t?

doomsday/client/src/ui/dd_input.cpp

@@ -1014,8 +1014,8 @@ void DD_ConvertEvent(const ddevent_t* ddEvent, event_t* ev)
         ev->type = EV_SYMBOLIC;
 #ifdef __64BIT__
         ASSERT_64BIT(ddEvent->symbolic.name);
-        ev->data1 = (int)(((int64_t) ddEvent->symbolic.name) & 0xffffffff); // low dword
-        ev->data2 = (int)(((int64_t) ddEvent->symbolic.name) >> 32); // high dword
+        ev->data1 = (int)(((uint64_t) ddEvent->symbolic.name) & 0xffffffff); // low dword
+        ev->data2 = (int)(((uint64_t) ddEvent->symbolic.name) >> 32); // high dword
 #else
         ASSERT_NOT_64BIT(ddEvent->symbolic.name);
 

doomsday/plugins/common/src/m_ctrl.c

@@ -695,7 +695,12 @@ int MNBindings_PrivilegedResponder(mn_object_t* obj, event_t* ev)
 #ifndef __64BIT__
         symbol = (const char*) ev->data1;
 #else
-        symbol = (const char*)(((int64_t)ev->data1) | (((int64_t)ev->data2)) << 32);
+        {
+            uint64_t address = (uint32_t) ev->data2;
+            address <<= 32;
+            address |= (uint32_t) ev->data1;
+            symbol = (const char*) address;
+        }
 #endif
 
         if(strncmp(symbol, "echo-", 5))