md: Use pledge()

Author: https://github.com/bgianfo
Commit: e45a4b0931
Pull-request: https://github.com/SerenityOS/serenity/pull/1065

Userland/md.cpp

@@ -5,6 +5,11 @@
 
 int main(int argc, char* argv[])
 {
+    if (pledge("stdio rpath", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
     const char* file_name = nullptr;
     bool html = false;
 
@@ -27,6 +32,11 @@ int main(int argc, char* argv[])
         return 1;
     }
 
+    if (pledge("stdio", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
     auto buffer = file->read_all();
     dbg() << "Read size " << buffer.size();