[PATCH] migration: use parameters.mode in cpr_state_save

[Steve Sistare <steven.sistare@oracle.com>]

qmp_migrate guarantees that cpr_channel is not null for
MIG_MODE_CPR_TRANSFER when cpr_state_save is called:

    qmp_migrate()
        if (s->parameters.mode == MIG_MODE_CPR_TRANSFER && !cpr_channel) {
            return;
        }
        cpr_state_save(cpr_channel)

but cpr_state_save checks for mode differently before using channel,
and Coverity cannot infer that they are equivalent in outgoing QEMU,
and warns that channel may be NULL:

    cpr_state_save(channel)
        MigMode mode = migrate_mode();
        if (mode == MIG_MODE_CPR_TRANSFER) {
            f = cpr_transfer_output(channel, errp);

To make Coverity happy, use parameters.mode in cpr_state_save.

Resolves: Coverity CID 1590980
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 migration/cpr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/migration/cpr.c b/migration/cpr.c
index 584b0b9..7f20bd5 100644
--- a/migration/cpr.c
+++ b/migration/cpr.c
@@ -8,6 +8,7 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "migration/cpr.h"
+#include "migration/migration.h"
 #include "migration/misc.h"
 #include "migration/options.h"
 #include "migration/qemu-file.h"
@@ -132,7 +133,7 @@ int cpr_state_save(MigrationChannel *channel, Error **errp)
 {
     int ret;
     QEMUFile *f;
-    MigMode mode = migrate_mode();
+    MigMode mode = migrate_get_current()->parameters.mode;
 
     trace_cpr_state_save(MigMode_str(mode));
 
-- 
1.8.3.1