Fixed incorrect ngx_str_set() usage, broken in c82b2e020b9f.
Fixed incorrect ngx_str_set() usage, broken in c82b2e020b9f.

Found by Coverity Scan CID 1135525.

Signed-off-by: Piotr Sikora <2c0eb4a25a7cde333ff2d0860cb06051925fd74f@cloudflare.com>

hy0kl/nginx,hy0kl/nginx,hy0kl/nginx,firebase/nginx,firebase/nginx,firebase/nginx,firebase/nginx