webui: fix http_serve_file() for FreeBSD #1125
Merged
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This patch fixes two major problems of FreeBSD port of tvheadend:
Unlike Linux sendfile(), FreeBSD sendfile() requires an explicit
file offset, and return value must be checked to catch any error
occurred. (i.e., closed connection)
Patch tested with the latest FreeBSD port of tvheadend-4.2.6.