libdpkg: in parsedb() finish the rename of stat -> st

This was forgotten in commit 5cf023f2d5bf609b6aba20aa5b5e285a91fbbbce.

lib/dpkg/parse.c

@@ -387,7 +387,7 @@ int parsedb(const char *filename, enum parsedbflags flags,
   }
   if (data != NULL) {
 #ifdef HAVE_MMAP
-    munmap(data, stat.st_size);
+    munmap(data, st.st_size);
 #else
     free(data);
 #endif