Fix store_read calls

store_read takes a look at the size to determine whether to fill the
provided buffer or not. Even if providing a null buffer we should set
the size to 0.

* defpager/defpager.c (pager_read_page): Initialize nread to 0.
* storeio/dev.c (buffered_rw): Initialize amount to 0.
* fatfs/fat.c (fat_read_sblock): Initialize read to the size of the boot
sector. Reuse it as such.

1 files changed, 1 insertions, 1 deletions

diff --git a/defpager/defpager.c b/defpager/defpager.c
index f97b489c..3b3cda1e 100644
--- a/defpager/defpager.c
+++ b/defpager/defpager.c
@@ -58,7 +58,7 @@ pager_read_page (struct user_pager_info *pager,
 		 int *write_lock)
 {
   int pfn = page / vm_page_size;
-  size_t nread;
+  size_t nread = 0;
   
   /* We never request write locks. */
   *write_lock = 0;