header file cleanup

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I03920e51bab3cb704f156ea9c62a0a38fd65a3a9
diff --git a/libbpf_android/include/libbpf_android.h b/libbpf_android/include/libbpf_android.h
index a2f78b4..b1c6a0c 100644
--- a/libbpf_android/include/libbpf_android.h
+++ b/libbpf_android/include/libbpf_android.h
@@ -15,8 +15,7 @@
  * limitations under the License.
  */
 
-#ifndef LIBBPF_SYSTEM_H
-#define LIBBPF_SYSTEM_H
+#pragma once
 
 #include <libbpf.h>
 #include <linux/bpf.h>
@@ -32,5 +31,3 @@
 
 }  // namespace bpf
 }  // namespace android
-
-#endif