winedbg: Extract address from expression for listing source at address. (RESEND)

[Dylan Smith]

(now applies cleanly against the origin)

Previously the address that was used was the address of the expression
value.  This patch extracts that value from the expression so the correct
address is used for the list command.
---
 programs/winedbg/dbg.y |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
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