[libstdc++ PATCH] money_get::do_get subscripts empty string

[Doug Gregor]

This patch fixes an unsafe loop in money_get::do_get that invokes 
undefined behavior when __tmp_units is an empty string (this does 
occur, and was tripping up the debug mode test runs). Tested on 
powerpc-apple-darwin6.6; no regressions.

Ok to commit?

	Doug

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