header file cleanup

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I03920e51bab3cb704f156ea9c62a0a38fd65a3a9
diff --git a/libbpf_android/include/bpf/BpfMap.h b/libbpf_android/include/bpf/BpfMap.h
index 3e7413e..c42801a 100644
--- a/libbpf_android/include/bpf/BpfMap.h
+++ b/libbpf_android/include/bpf/BpfMap.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef BPF_BPFMAP_H
-#define BPF_BPFMAP_H
+#pragma once
 
 #include <linux/bpf.h>
 
@@ -258,5 +257,3 @@
 
 }  // namespace bpf
 }  // namespace android
-
-#endif