Request body: added alert to catch duplicate body saving. If due to an error ngx_http_request_body_save_filter() is called more than once with rb->rest == 0, this used to result in a segmentation fault. Added an alert to catch such errors, just in case.

if exists("b:did_indent")
    finish
endif
let b:did_indent = 1

setlocal indentexpr=

" cindent actually works for nginx' simple file structure
setlocal cindent
" Just make sure that the comments are not reset as defs would be.
setlocal cinkeys-=0#