1 files changed, 2 insertions, 2 deletions

diff --git a/stack.c b/stack.c
index f594775..162324e 100644
--- a/stack.c
+++ b/stack.c
@@ -47,10 +47,10 @@ stack_push(struct stack *stack, T data)
 bool
 stack_pop(struct stack *stack, T *data)
 {
-        if ( stack->head != NULL ) {
+        if ( stack->head ) {
                 struct stack_item *next = stack->head->next;
 
-                if ( data != NULL ) {
+                if ( data ) {
                         *data = stack->head->data;
                 }
                 free(stack->head);