migration: ram_release_pages() always receive 1 page as argument

Remove the pages argument. And s/pages/page/

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>

---

- Use 1LL instead of casts (philmd)
- Change the whole 1ULL for TARGET_PAGE_SIZE

migration/ram.c

@@ -1204,13 +1204,13 @@ static int save_zero_page(RAMState *rs, RAMBlock *block, ram_addr_t offset)
     return -1;
 }
 
-static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
+static void ram_release_page(const char *rbname, uint64_t offset)
 {
     if (!migrate_release_ram() || !migration_in_postcopy()) {
         return;
     }
 
-    ram_discard_range(rbname, offset, ((ram_addr_t)pages) << TARGET_PAGE_BITS);
+    ram_discard_range(rbname, offset, TARGET_PAGE_SIZE);
 }
 
 /*
@@ -1365,7 +1365,7 @@ static bool do_compress_ram_page(QEMUFile *f, z_stream *stream, RAMBlock *block,
     }
 
 exit:
-    ram_release_pages(block->idstr, offset & TARGET_PAGE_MASK, 1);
+    ram_release_page(block->idstr, offset & TARGET_PAGE_MASK);
     return zero_page;
 }
 
@@ -2153,7 +2153,7 @@ static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss)
             xbzrle_cache_zero_page(rs, block->offset + offset);
             XBZRLE_cache_unlock();
         }
-        ram_release_pages(block->idstr, offset, res);
+        ram_release_page(block->idstr, offset);
         return res;
     }