qemu: remove ATTRIBUTE_UNUSED in qemuProcessHandleMonitorEOF

This attribute is not needed here, since @mon is in use.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.vnet.ibm.com>
Reviewed-by: NBjoern Walk <bwalk@linux.vnet.ibm.com>

src/qemu/qemu_process.c

@@ -279,7 +279,7 @@ qemuConnectAgent(virQEMUDriverPtr driver, virDomainObjPtr vm)
  * performed
  */
 static void
-qemuProcessHandleMonitorEOF(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
+qemuProcessHandleMonitorEOF(qemuMonitorPtr mon,
                             virDomainObjPtr vm,
                             void *opaque)
 {