OSSL_HTTP_proxy_connect(): Fix glitch in response HTTP header parsing
OSSL_HTTP_proxy_connect(): Fix glitch in response HTTP header parsing

Fixes #17247

Reviewed-by: Paul Dale <ddec78389666b4f7c9b4d110380c848489a3e4aa@openssl.org>
Reviewed-by: Tomas Mraz <2bc6038c3dfca09b2da23c8b6da8ba884dc2dcc2@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17250)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl