altsvc: decrease entry count when expired entry is removed #5553
Prior to this change the lookup function did not adjust the count
I noticed this while investigating #5552 but it is not related.
Prior to this change the lookup function did not adjust the count when purging expired entries. AFAICS the count is only used by test unit1654 so there does not appear to have been any consequence. Closes #xxxx
It was superfluous since we have the list.size alredy Reported-by: Jay Satiro Fixes #5553