Avoid uninitialized variable warnings in gcc#7258
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gcc thinks this could be uninitialized; make it so.
gcc thinks this could be used uninitialized; cope with this.
`init_common` could return an uninitialized variable when there are no subsystems; simply return `0` in this case.
gcc thinks this could be used uninitialized; cope with this.
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gcc 4.8.5 is showing warnings for uninitialized variables in a handful of spaces. Initialize those variables, even where these are obviously unnecessary.