Rename mis->file to from_src_file

'file' becomes confusing when you have flows in each direction;
rename to make it clear.
This leaves just the main forward direction ms->file, which is used
in a lot of places and is probably not worth renaming given the churn.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

include/migration/migration.h

@@ -48,7 +48,7 @@ typedef QLIST_HEAD(, LoadStateEntry) LoadStateEntry_Head;
 
 /* State for the incoming migration */
 struct MigrationIncomingState {
-    QEMUFile *file;
+    QEMUFile *from_src_file;
 
     /* See savevm.c */
     LoadStateEntry_Head loadvm_handlers;

migration/migration.c

@@ -95,7 +95,7 @@ MigrationIncomingState *migration_incoming_get_current(void)
 MigrationIncomingState *migration_incoming_state_new(QEMUFile* f)
 {
     mis_current = g_new0(MigrationIncomingState, 1);
-    mis_current->file = f;
+    mis_current->from_src_file = f;
     QLIST_INIT(&mis_current->loadvm_handlers);
 
     return mis_current;