[uart] void functions should return nothing (#7829)
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@@ -40,7 +40,7 @@ class UARTDevice {
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int available() { return this->parent_->available(); }
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int available() { return this->parent_->available(); }
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void flush() { return this->parent_->flush(); }
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void flush() { this->parent_->flush(); }
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// Compat APIs
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// Compat APIs
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int read() {
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int read() {
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