[Bug-ed] Infinite loop in ed-0.6 and older

[Karsten Hopp]

Hello,

ed enters an infinite loop when there's only one line in the edited file and 
you're
using the ?re syntax.

Example:
echo a >test
ed test
?a

Cause seems to be a missing check for addr (addr==0) in re.c line 246
Reproducible with ed-0.5 and ed-0.6, I didn't check any other versions.

  Karsten

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