public default boolean hasUnknownCallingConventionName() {
		return getCallingConvention() == null;
	}
Determine if this signature has an unknown or unrecognized calling convention name.
@return true if calling convention is unknown or unrecognized name, else false.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/listing/FunctionSignature.java