nfsd: return 0 on reads of fault injection files

debugfs read operations were returning the contents of an uninitialized u64.
Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/fault_inject.c

@@ -58,6 +58,7 @@ static int nfsd_inject_set(void *op_ptr, u64 val)
 
 static int nfsd_inject_get(void *data, u64 *val)
 {
+	*val = 0;
 	return 0;
 }