Remove non-breaking space in comment

It was added by mistake before the 'If' by commit 71408079.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

src/qemu/qemu_domain.c

@@ -1340,7 +1340,7 @@ qemuDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
          * If the address is generated by us (starts with our
          * channel dir), we should not keep it in the persistent
          * XML.  If libvirt is the one who generated it, users
-         * shouldn't care about that.  If they do, they are
+         * shouldn't care about that.  If they do, they are
          * supposed to set it themselves.
          */
         VIR_FREE(dev->data.chr->source.data.nix.path);