Style: use %N instead of '\n' where appropriate.

src/http/modules/ngx_http_proxy_module.c

diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index ed596f8..61af3df 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -1294,7 +1294,7 @@
     }
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
-                   "http proxy header:\n\"%*s\"",
+                   "http proxy header:%N\"%*s\"",
                    (size_t) (b->last - b->pos), b->pos);
 
     if (plcf->body_set == NULL && plcf->upstream.pass_request_body) {

src/mail/ngx_mail_auth_http_module.c

diff --git a/src/mail/ngx_mail_auth_http_module.c b/src/mail/ngx_mail_auth_http_module.c
index 8094bbc..eb7531c 100644
--- a/src/mail/ngx_mail_auth_http_module.c
+++ b/src/mail/ngx_mail_auth_http_module.c
@@ -1269,7 +1269,7 @@
     l.len = b->last - b->pos;
     l.data = b->pos;
     ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
-                   "mail auth http header:\n\"%V\"", &l);
+                   "mail auth http header:%N\"%V\"", &l);
     }
 #endif