fork: fix return value not being set in child #2151
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10 warnings
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ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
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ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
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ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
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ignoring return value of 'write' declared with attribute 'warn_unused_result' [-Wunused-result]
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ignoring return value of 'pipe' declared with attribute 'warn_unused_result' [-Wunused-result]
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ignoring return value of 'write' declared with attribute 'warn_unused_result' [-Wunused-result]
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format not a string literal and no format arguments [-Wformat-security]
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#warning "poweroff unsupported, using halt as fallback" [-Wcpp]
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variable 'from_getty' set but not used [-Wunused-but-set-variable]
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variable 'opts' set but not used [-Wunused-but-set-variable]
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