core/static: Add missing break in switch

Reported by Coverity as CID #970990.
core/ini: change ini_get_line size type

The only user of ini_get_line uses a size_t as size. Since off_t
and size_t have different storage size just switch ini_get_line
to size_t.

Reported by Coverity as CID #970984.
core/yaml: use size_t for buffer lenght in yaml_get_line

As the only user pass a size_t value and they have different
storage size.

Reported by Coverity as CID #970987.
plugins/http: remove self assignment

Also while at it cleanup the handling of the if branch around
the ifdefery.

Reported by Coverity as CID #970999.
Merge pull request #170 from xrmx/coverity9

A few more coverity fixes