When recv() failed, the current code assumes the return value
of recv() is a negative errno. It's wrong. Actually the return value
in case of error is -1. The wrong assumption ends up with reporting
EPERM, as EPERM happens to be -(-1).
This commit changes the code to leave the errno set by the failed
recv() as it is. It should be fine as wget_base() has the same
error returning convention as recv(). That is, return -1 (ERROR)
and set errno in the case of failure.
NOTE: the close() after the errout label can also fail and overwrite
the errno. I don't feel it's a big problem as wget_base() doesn't have
any promise about which error should be reported.
83324b68f9