migration: Make state definitions local

Signed-off-by: Juan Quintela <[email protected]>
diff --git a/migration.c b/migration.c
index b5929db..3db12ef 100644
--- a/migration.c
+++ b/migration.c
@@ -31,6 +31,14 @@
     do { } while (0)
 #endif
 
+enum {
+    MIG_STATE_ERROR,
+    MIG_STATE_SETUP,
+    MIG_STATE_CANCELLED,
+    MIG_STATE_ACTIVE,
+    MIG_STATE_COMPLETED,
+};
+
 #define MAX_THROTTLE  (32 << 20)      /* Migration speed throttling */
 
 static NotifierList migration_state_notifiers =
diff --git a/migration.h b/migration.h
index 23d347a..a1f80d0 100644
--- a/migration.h
+++ b/migration.h
@@ -18,14 +18,6 @@
 #include "qemu-common.h"
 #include "notify.h"
 
-enum {
-    MIG_STATE_ERROR,
-    MIG_STATE_SETUP,
-    MIG_STATE_CANCELLED,
-    MIG_STATE_ACTIVE,
-    MIG_STATE_COMPLETED,
-};
-
 typedef struct MigrationState MigrationState;
 
 struct MigrationState