qemu: caps: Don't try to ask for CAP_DAC_OVERRIDE if non-root

It will not work. This breaks qemu capabilities probing as a user.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>

src/qemu/qemu_capabilities.c

@@ -4524,6 +4524,7 @@ virQEMUCapsInitQMPCommandRun(virQEMUCapsInitQMPCommandPtr cmd,
 #if WITH_CAPNG
     /* QEMU might run into permission issues, e.g. /dev/sev (0600), override
      * them just for the purpose of probing */
+    if (geteuid() == 0)
         virCommandAllowCap(cmd->cmd, CAP_DAC_OVERRIDE);
 #endif