Leaving interpolation into JSON to qmp() is more robust than building
QMP input manually, as explained in the recent commit "tests: Clean up
string interpolation into QMP input (simple cases)".

migrate_recover() builds QMP input manually because wait_command()
can't interpolate.  Well, it can since the previous commit.  Simplify
accordingly.

Bonus: gets rid of a non-literal format string.  A step towards
compile-time format string checking without triggering
-Wformat-nonliteral.

Cc: Juan Quintela <quint...@redhat.com>
Cc: Dr. David Alan Gilbert <dgilb...@redhat.com>
Signed-off-by: Markus Armbruster <arm...@redhat.com>
---
 tests/migration-test.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/tests/migration-test.c b/tests/migration-test.c
index 55f9d006ec..66a4cd2395 100644
--- a/tests/migration-test.c
+++ b/tests/migration-test.c
@@ -355,13 +355,12 @@ static void migrate_pause(QTestState *who)
 static void migrate_recover(QTestState *who, const char *uri)
 {
     QDict *rsp;
-    gchar *cmd = g_strdup_printf(
-        "{ 'execute': 'migrate-recover', "
-        "  'id': 'recover-cmd', "
-        "  'arguments': { 'uri': '%s' } }", uri);
 
-    rsp = wait_command(who, cmd);
-    g_free(cmd);
+    rsp = wait_command(who,
+                       "{ 'execute': 'migrate-recover', "
+                       "  'id': 'recover-cmd', "
+                       "  'arguments': { 'uri': %s } }",
+                       uri);
     qobject_unref(rsp);
 }
 
-- 
2.17.1


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