Check the validity overincreasing the window size

[todo]

two/src/http2/flowcontrol.c

Lines 113 to 118 in 726ec07

	//TODO: Check the validity of this error
	/*
	if (window_size_increment > h2s->local_window.window_used) {
	ERROR("Increment to big. PROTOCOL_ERROR");
	return HTTP2_RC_ERROR;
	}

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This issue was generated by todo based on a TODO: comment in 726ec07. It's been assigned to @Gedoix because they committed the code.