[patch, testsuite] store memory address in unsigned type

[Tom Tromey]

>>>>> "Yao" == Yao Qi <yao@codesourcery.com> writes:

Yao> 2011-05-13  Yao Qi  <yao@codesourcery.com>
Yao> 	* gdb.trace/tfile.c (add_memory_block): Store address in unsigned
Yao> 	type.

Looks reasonable to me.  Ok.

Tom