Actually return when DLL / API isn't found properly in timing check

Forgot to put returns in there, whoops.

al-khaser/timing-attacks/timing.cpp

@@ -26,6 +26,7 @@ VOID timing_NtDelayexecution(UINT delayInMilliSeconds)
 		// is essentially 0 however since
 		// ntdll.dll is a vital system resource
 		printf("Failed to open a handle to NTDLL... this is suspicious!\n");
+		return;
 	}
 
 	NtDelayExecution = (pNtDelayExecution)GetProcAddress(hNtdll, "NtDelayExecution");
@@ -34,6 +35,7 @@ VOID timing_NtDelayexecution(UINT delayInMilliSeconds)
 		// Handle however it fits your needs but as before,
 		// if this is missing there are some SERIOUS issues with the OS
 		printf("NTDLL does not have an NtDelayExecution entry point... this is suspicious!\n");
+		return;
 	}
 
 	// Time to finally make the call