Reset of r->uri.len on URI parsing errors.
Reset of r->uri.len on URI parsing errors.

This ensures that debug logging and the $uri variable (if used in
400 Bad Request processing) will not try to access uninitialized
memory.

Found by Sergey Bobrov.

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