Came to my attention that i can be used uninitialized ((thanks, Johnny), so:

diff --git a/src/core/ngx_proxy_protocol.c b/src/core/ngx_proxy_protocol.c
index 04dae8b..21c710a 100644
--- a/src/core/ngx_proxy_protocol.c
+++ b/src/core/ngx_proxy_protocol.c
@@ -13,7 +13,7 @@ u_char *
ngx_proxy_protocol_read(ngx_connection_t *c, u_char *buf, u_char *last)
{
size_t len;
- ngx_uint_t i, n;
+ ngx_uint_t i=0, n;
u_char ch, *p, *pp;
ngx_str_t addr[2], port[2];

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