migration: rename qemu_file_has_error to qemu_file_get_error

Now the function returned errno, so it is better the new name.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>

arch_init.c

@@ -451,7 +451,7 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
 
             qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
         }
-        if (qemu_file_has_error(f)) {
+        if (qemu_file_get_error(f)) {
             return -EIO;
         }
     } while (!(flags & RAM_SAVE_FLAG_EOS));