Fix GCC warning if first "goto cleanup" branch is taken.
Fix GCC warning if first "goto cleanup" branch is taken.

mod_proxy_http2.c: In function 'proxy_http2_handler':
mod_proxy_http2.c:460:12: error: 'status' may be used uninitialized in this function [-Werror=maybe-uninitialized]
         if (status != APR_SUCCESS) {
            ^

icing/mod_h2,icing/mod_h2,icing/mod_h2,icing/mod_h2,icing/mod_h2