Fixed ngx_parse_time() out of bounds access (ticket #821). The code failed to ensure that "s" is within the buffer passed for parsing when checking for "ms", and this resulted in unexpected errors when parsing non-null-terminated strings with trailing "m". The bug manifested itself when the expires directive was used with variables. Found by Roman Arutyunyan.

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#