vold: Fix format argument bug

Signed-off-by: San Mehat <san@google.com>
diff --git a/Fat.cpp b/Fat.cpp
index f934ebc..f85bd8e 100644
--- a/Fat.cpp
+++ b/Fat.cpp
@@ -175,7 +175,7 @@
     args[6] = "8";
     args[7] = fsPath;
     args[8] = NULL;
-    rc = logwrap(7, args, 1);
+    rc = logwrap(9, args, 1);
 
     if (rc == 0) {
         LOGI("Filesystem formatted OK");