qemu: Avoid fd leak on incoming tunneled migration

While qemuProcessIncomingDefNew takes an fd argument and stores it in
qemuProcessIncomingDef structure, the caller is still responsible for
closing the file descriptor.

Introduced by commit v1.2.21-140-ge7c6f457.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_migration.c

@@ -2690,7 +2690,6 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
                                                   listenAddress, port,
                                                   dataFD[0])))
         goto stopjob;
-    dataFD[0] = -1; /* the FD is now owned by incoming */
 
     if (qemuProcessPrepareDomain(dconn, driver, vm,
                                  VIR_QEMU_PROCESS_START_AUTODESTROY) < 0)

src/qemu/qemu_process.c

@@ -4166,6 +4166,9 @@ qemuProcessIncomingDefFree(qemuProcessIncomingDefPtr inc)
  * This function does not copy @path, the caller is responsible for keeping
  * the @path pointer valid during the lifetime of the allocated
  * qemuProcessIncomingDef structure.
+ *
+ * The caller is responsible for closing @fd, calling
+ * qemuProcessIncomingDefFree will NOT close it.
  */
 qemuProcessIncomingDefPtr
 qemuProcessIncomingDefNew(virQEMUCapsPtr qemuCaps,