Follow-up to r37868, follow our de facto standard of returning errors from within a loop without destroying the iterpool, it will be destroyed when the error is handled.
Follow-up to r37868, follow our de facto standard of returning errors from
within a loop without destroying the iterpool, it will be destroyed when the
error is handled.

Suggested by: hwright

* subversion/libsvn_subr/hash.c:
  (hash_read): Revert to pre-r37868 behavior of simply returning errors from
  within the stream reading loop.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion