scripts/gdb: Fix a python exception in mtree.py

The following exception is threw:
Python Exception <class 'NameError'> name 'long' is not defined:
Error occurred in Python command: name 'long' is not defined

Python 2.4+, int()/long() have been unified, so replace long
with int.
Signed-off-by: NYang Wei <w90p710@gmail.com>
Message-id: 1449316340-4030-1-git-send-email-w90p710@gmail.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

scripts/qemugdb/mtree.py

@@ -21,7 +21,7 @@ def isnull(ptr):
     return ptr == gdb.Value(0).cast(ptr.type)
 
 def int128(p):
-    return long(p['lo']) + (long(p['hi']) << 64)
+    return int(p['lo']) + (int(p['hi']) << 64)
 
 class MtreeCommand(gdb.Command):
     '''Display the memory tree hierarchy'''
@@ -40,11 +40,11 @@ def queue_root(self, varname):
     def process_queue(self):
         while self.queue:
             ptr = self.queue.pop(0)
-            if long(ptr) in self.seen:
+            if int(ptr) in self.seen:
                 continue
             self.print_item(ptr)
     def print_item(self, ptr, offset = gdb.Value(0), level = 0):
-        self.seen.add(long(ptr))
+        self.seen.add(int(ptr))
         addr = ptr['addr']
         addr += offset
         size = int128(ptr['size'])
@@ -58,8 +58,8 @@ def print_item(self, ptr, offset = gdb.Value(0), level = 0):
             klass = ' (RAM)'
         gdb.write('%s%016x-%016x %s%s (@ %s)\n'
                   % ('  ' * level,
-                     long(addr),
-                     long(addr + (size - 1)),
+                     int(addr),
+                     int(addr + (size - 1)),
                      ptr['name'].string(),
                      klass,
                      ptr,