[PATCH] sed: save the last regex for use later

[Nguyen Thai Ngoc Duy]

I'm not really get into sed source code, so I might be wrong. Please recheck it.
With this patch, the following command should return 'abc' (GNU sed
does but busybox did not):
echo 'URL: abc'|busybox sed -ne '/^URL: */{ s///p; q }'
-- 
Duy
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