nvidia: fix return value if no device is found

xmrstak/backend/amd/autoAdjust.hpp

@@ -44,7 +44,6 @@ public:
      */
     bool printConfig()
     {
-
 		int platformIndex = getAMDPlatformIdx();
 
 		if(platformIndex == -1)
@@ -58,13 +57,12 @@ public:
 
 		int deviceCount = devVec.size();
 
-        if(deviceCount == 0)
+		if(deviceCount == 0)
             return false;
 
- 
+
         generateThreadConfig(platformIndex);
 		return true;
-
     }
 
 private:

xmrstak/backend/nvidia/autoAdjust.hpp

@@ -38,7 +38,7 @@ public:
     {
 		int deviceCount = 0;
         if(cuda_get_devicecount(&deviceCount) == 0)
-            std::exit(0);
+            return false;
         // evaluate config parameter for if auto adjustment is needed
                 // evaluate config parameter for if auto adjustment is needed
         for(int i = 0; i < deviceCount; i++)