unexport do_munmap()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/mm/mmap.c b/mm/mmap.c
index 98ef8a6..6cb3193 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2125,7 +2125,6 @@
 
 	return 0;
 }
-EXPORT_SYMBOL(do_munmap);
 
 int vm_munmap(unsigned long start, size_t len)
 {