vfio: Cleanup error_report()s

With the conversion to tracepoints, a couple previous DPRINTKs are
now quite a bit more visible and are really just informational.
Remove these and add a bit more description to another.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 4f15c86..cf483ff 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -566,7 +566,7 @@
         };
 
         if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
-            error_report("KVM_CREATE_DEVICE: %m\n");
+            error_report("Failed to create KVM VFIO device: %m\n");
             return;
         }
 
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index e380959..b4e73d1 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2801,8 +2801,6 @@
             tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev);
             if (vfio_pci_host_match(&host, &tmp->host)) {
                 if (single) {
-                    error_report("vfio: found another in-use device "
-                            "%s\n", vbasedev_iter->name);
                     ret = -EINVAL;
                     goto out_single;
                 }
@@ -2815,7 +2813,6 @@
     }
 
     if (!single && !multi) {
-        error_report("vfio: No other in-use devices for multi hot reset\n");
         ret = -EINVAL;
         goto out_single;
     }