fix SAL

Author: Michael Agun

include/ebpf_api.h

@@ -903,7 +903,7 @@ extern "C"
         size_t page_cnt,
         perf_buffer_sample_fn sample_cb,
         perf_buffer_lost_fn lost_cb,
-        void* ctx,
+        _In_opt_ void* ctx,
         _In_opt_ const struct ebpf_perf_buffer_opts* opts) EBPF_NO_EXCEPT;
 
 #ifdef __cplusplus

libs/api/libbpf_map.cpp

@@ -491,14 +491,14 @@ perf_buffer__new(
     return ebpf_perf_buffer__new(map_fd, page_cnt, sample_cb, lost_cb, ctx, &ebpf_opts);
 }
 
-struct perf_buffer*
+_Ret_maybenull_ struct perf_buffer*
 ebpf_perf_buffer__new(
     int map_fd,
     size_t page_cnt,
     perf_buffer_sample_fn sample_cb,
     perf_buffer_lost_fn lost_cb,
-    void* ctx,
-    const struct ebpf_perf_buffer_opts* opts) EBPF_NO_EXCEPT
+    _In_opt_ void* ctx,
+    _In_opt_ const struct ebpf_perf_buffer_opts* opts) EBPF_NO_EXCEPT
 {
     ebpf_result result = EBPF_SUCCESS;
     perf_buffer_t* local_perf_buffer = nullptr;