manger: fix lkm detection (tiann#2654)

原因请看
SukiSU-Ultra/SukiSU-Ultra#217 (comment)

文中介绍的是lkm的问题 但实测下来gki也有这样的问题 但修复方法通用

Author: HSSkyBoy

manager/app/src/main/cpp/ksu.cc

@@ -50,12 +50,13 @@ bool become_manager(const char* pkg) {
 }
 
 // cache the result to avoid unnecessary syscall
-static bool is_lkm;
-int get_version() {
+static bool is_lkm = false;
+
+int get_version(void) {
     int32_t version = -1;
-    int32_t lkm = 0;
-    ksuctl(CMD_GET_VERSION, &version, &lkm);
-    if (!is_lkm && lkm != 0) {
+    int32_t flags = 0;
+    ksuctl(CMD_GET_VERSION, &version, &flags); 
+    if (!is_lkm && (flags & 0x1)) {
         is_lkm = true;
     }
     return version;
@@ -96,4 +97,4 @@ bool is_su_enabled() {
     // if ksuctl failed, we assume su is enabled, and it cannot be disabled.
     ksuctl(CMD_IS_SU_ENABLED, &enabled, nullptr);
     return enabled;
-}
+}