migration: remove PostcopyDiscardState from typedefs.h

It is defined and referred to exclusively from a .c file.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h
index ab24ca2..2b1948a 100644
--- a/include/qemu/typedefs.h
+++ b/include/qemu/typedefs.h
@@ -96,7 +96,6 @@
 typedef struct PCIExpressHost PCIExpressHost;
 typedef struct PCIHostDeviceAddress PCIHostDeviceAddress;
 typedef struct PCIHostState PCIHostState;
-typedef struct PostcopyDiscardState PostcopyDiscardState;
 typedef struct Property Property;
 typedef struct PropertyInfo PropertyInfo;
 typedef struct QBool QBool;
diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index eccff49..3419779 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -44,7 +44,7 @@
  */
 #define MAX_DISCARDS_PER_COMMAND 12
 
-struct PostcopyDiscardState {
+typedef struct PostcopyDiscardState {
     const char *ramblock_name;
     uint16_t cur_entry;
     /*
@@ -54,7 +54,7 @@
     uint64_t length_list[MAX_DISCARDS_PER_COMMAND];
     unsigned int nsentwords;
     unsigned int nsentcmds;
-};
+} PostcopyDiscardState;
 
 static NotifierWithReturnList postcopy_notifier_list;