Core: fixed segfault with null in wildcard hash names. A configuration like server { server_name .foo^@; } server { server_name .foo; } resulted in a segmentation fault during construction of server names hash. Reported by Markus Linnala. Found with afl-fuzz.

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#