switch aio and shm to do_mmap_pgoff(), make do_mmap() static

after all, 0 bytes and 0 pages is the same thing...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/mm/nommu.c b/mm/nommu.c
index 8cbfd62..a1792ed 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1232,7 +1232,7 @@
 /*
  * handle mapping creation for uClinux
  */
-static unsigned long do_mmap_pgoff(struct file *file,
+unsigned long do_mmap_pgoff(struct file *file,
 			    unsigned long addr,
 			    unsigned long len,
 			    unsigned long prot,
@@ -1470,7 +1470,7 @@
 	return -ENOMEM;
 }
 
-unsigned long do_mmap(struct file *file, unsigned long addr,
+static unsigned long do_mmap(struct file *file, unsigned long addr,
 	unsigned long len, unsigned long prot,
 	unsigned long flag, unsigned long offset)
 {