[OpenMP] Fix an issue of wrong return type of DeviceRTLTy::getNumOfDevices

[tianshilei1992]

Summary

There is a typo in DeviceRTLTy::getNumOfDevices that the type of its return value is bool. It will lead to a problem of wrong device number returned from omp_get_num_devices.

[jdoerfert]

LGTM. Feel free to commit such obvious fixes w/o review.

openmp/libomptarget/plugins/cuda/src/rtl.cpp

~DeviceRTLTy() {
     }
   }
 
   // Check whether a given DeviceId is valid
   bool isValidDeviceId(const int DeviceId) const {
     return DeviceId >= 0 && DeviceId < NumberOfDevices;
   }
 
-  bool getNumOfDevices() const { return NumberOfDevices; }
+  int getNumOfDevices() const { return NumberOfDevices; }
 
   void setRequiresFlag(const int64_t Flags) { this->RequiresFlags = Flags; }
 
   int initDevice(const int DeviceId) {
     CUdevice Device;
 
     DP("Getting device %d\n", DeviceId);
     CUresult Err = cuDeviceGet(&Device, DeviceId);