libbpf-tools: Fix opensnoop compile errors when uses BlazeSym

opensnoop.c:208:79: error: invalid type argument of ‘->’ (have ‘struct event’)
  208 |                 { .src_type = SRC_T_PROCESS, .params = { .process = { .pid = e->pid }}},
      |                                                                               ^~

libbpf-tools/opensnoop.c

@@ -205,7 +205,7 @@ void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)
  struct tm *tm;
 #ifdef USE_BLAZESYM
  sym_src_cfg cfgs[] = {
- { .src_type = SRC_T_PROCESS, .params = { .process = { .pid = e->pid }}},
+ { .src_type = SRC_T_PROCESS, .params = { .process = { .pid = e.pid }}},
  };
  const blazesym_result *result = NULL;
  const blazesym_csym *sym;
@@ -217,8 +217,8 @@ void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)
  int fd, err;
 
  if (data_sz < sizeof(e)) {
-  printf("Error: packet too small\n");
-  return;
+  printf("Error: packet too small\n");
+  return;
  }
  /* Copy data as alignment in the perf buffer isn't guaranteed. */
  memcpy(&e, data, sizeof(e));