@Override
		public String toString() {
			return "NoReturn At:" + getAddress() + "  because: " + getExplanation() +
				(whyAddr != null ? " at " + whyAddr : "");
		}
Get the next defined function after the current address.

Save the returned function along with the address
The nextFunction will be valid for any getNextFunction call for
addresses from lastGetNextFuncAddress to nextFunction,
which avoids an expensive funcMgr.getNextFunction() call

@param addr address to find the next defined function after
@return return the next function if found, or null otherwise
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/analysis/FindNoReturnFunctionsAnalyzer.java