[PATCH 3/3] migration/qemu-file: drop incorrect const from qemu_get_buffer_at buf

[Junjie Cao <junjie.cao@intel.com>]

qemu_get_buffer_at() reads data *into* buf -- it should not be const.
Drop the qualifier and remove the now-unnecessary cast.

Signed-off-by: Junjie Cao <junjie.cao@intel.com>
---
 migration/qemu-file.c | 4 ++--
 migration/qemu-file.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 9dfb202203..d5a48115bd 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -550,7 +550,7 @@ void qemu_put_buffer_at(QEMUFile *f, const uint8_t *buf, size_t buflen,
 }
 
 
-size_t qemu_get_buffer_at(QEMUFile *f, const uint8_t *buf, size_t buflen,
+size_t qemu_get_buffer_at(QEMUFile *f, uint8_t *buf, size_t buflen,
                           off_t pos)
 {
     Error *err = NULL;
@@ -559,7 +559,7 @@ size_t qemu_get_buffer_at(QEMUFile *f, const uint8_t *buf, size_t buflen,
         return 0;
     }
 
-    if (qio_channel_pread_all(f->ioc, (char *)buf, buflen, pos, &err) < 0) {
+    if (qio_channel_pread_all(f->ioc, buf, buflen, pos, &err) < 0) {
         qemu_file_set_error_obj(f, -EIO, err);
         return 0;
     }
diff --git a/migration/qemu-file.h b/migration/qemu-file.h
index a390554208..8f824c124d 100644
--- a/migration/qemu-file.h
+++ b/migration/qemu-file.h
@@ -76,7 +76,7 @@ void qemu_set_offset(QEMUFile *f, off_t off, int whence);
 off_t qemu_get_offset(QEMUFile *f);
 void qemu_put_buffer_at(QEMUFile *f, const uint8_t *buf, size_t buflen,
                         off_t pos);
-size_t qemu_get_buffer_at(QEMUFile *f, const uint8_t *buf, size_t buflen,
+size_t qemu_get_buffer_at(QEMUFile *f, uint8_t *buf, size_t buflen,
                           off_t pos);
 
 QIOChannel *qemu_file_get_ioc(QEMUFile *file);
-- 
2.43.0