Renumber RWF_UNCACHED

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/os/os-linux.h b/os/os-linux.h
index dbcde24..0f0bcc3 100644
--- a/os/os-linux.h
+++ b/os/os-linux.h
@@ -327,7 +327,7 @@
 #endif
 
 #ifndef RWF_UNCACHED
-#define RWF_UNCACHED	0x00000020
+#define RWF_UNCACHED	0x00000040
 #endif
 
 #ifndef RWF_WRITE_LIFE_SHIFT