qemu_command: Fix IOMMU validator name in two comments

When building command line for IOMMU or machine, there are two
comments which mention function that validate IOMMU. But they
both refer to old name which was changed in v6.3.0-rc1~246.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_command.c

@@ -6180,7 +6180,7 @@ qemuBuildIOMMUCommandLine(virCommandPtr cmd,
     case VIR_DOMAIN_IOMMU_MODEL_INTEL: {
         g_auto(virBuffer) opts = VIR_BUFFER_INITIALIZER;
 
-        /* qemuDomainDeviceDefValidateIOMMU() already made sure we have
+        /* qemuValidateDomainDeviceDefIOMMU() already made sure we have
          * one of QEMU_CAPS_DEVICE_INTEL_IOMMU or QEMU_CAPS_MACHINE_IOMMU:
          * here we handle the former case, while the latter is taken care
          * of in qemuBuildMachineCommandLine() */
@@ -6833,7 +6833,7 @@ qemuBuildMachineCommandLine(virCommandPtr cmd,
     if (def->iommu) {
         switch (def->iommu->model) {
         case VIR_DOMAIN_IOMMU_MODEL_INTEL:
-            /* qemuDomainDeviceDefValidateIOMMU() already made sure we have
+            /* qemuValidateDomainDeviceDefIOMMU() already made sure we have
              * one of QEMU_CAPS_DEVICE_INTEL_IOMMU or QEMU_CAPS_MACHINE_IOMMU:
              * here we handle the latter case, while the former is taken care
              * of in qemuBuildIOMMUCommandLine() */