Use implicit NULL tests

1 files changed, 2 insertions, 2 deletions

diff --git a/ls.c b/ls.c
index fbd05be..aabb305 100644
--- a/ls.c
+++ b/ls.c
@@ -12,13 +12,13 @@ int main(int argc, char **argv)
         dirname = ".";
     }
 
-    if ((dir = opendir(dirname)) == NULL) {
+    if (!(dir = opendir(dirname))) {
         perror("opendir");
         free(dir);
         exit(EXIT_FAILURE);
     }
 
-    while ((dirent = readdir(dir)) != NULL) {
+    while ((dirent = readdir(dir))) {
         fprintf(stdout, "%s\n", dirent->d_name);
     }
     if (errno) {