Description: Reduce error spew on unsupported hardware

Loading beignet on unsupported hardware produces ~20 errors, even
if another ICD is also installed that does support the hardware.
Replace these with one message that explicitly says what to do.

Author: Rebecca N. Palmer <rebecca_palmer@zoho.com>

--- a/src/cl_device_id.c
+++ b/src/cl_device_id.c
@@ -797,10 +797,10 @@ glk12eu_break:
     case PCI_CHIP_SANDYBRIDGE_BRIDGE_S:
     case PCI_CHIP_SANDYBRIDGE_S_GT:
       // Intel(R) HD Graphics SandyBridge not supported yet
+    default:
+      fprintf(stderr, "beignet-opencl-icd: no supported GPU found, this is probably the wrong opencl-icd package for this hardware\n(If you have multiple ICDs installed and OpenCL works, you can ignore this message)\n");
       ret = NULL;
       break;
-    default:
-      printf("cl_get_gt_device(): error, unknown device: %x\n", device_id);
   }
 
   if (ret == NULL)
--- a/src/intel/intel_driver.c
+++ b/src/intel/intel_driver.c
@@ -263,7 +263,6 @@ if(!intel_driver_is_active(intel)) {
 }
 
 if(!intel_driver_is_active(intel)) {
-  fprintf(stderr, "Device open failed, aborting...\n");
   return CL_DEVICE_NOT_FOUND;
 }
 
@@ -324,7 +323,6 @@ drm_client_t client;
 // usually dev_name = "/dev/dri/card%d"
 dev_fd = open(dev_name, O_RDWR);
 if (dev_fd == -1) {
-  fprintf(stderr, "open(\"%s\", O_RDWR) failed: %s\n", dev_name, strerror(errno));
   return 0;
 }