[Bugfix][API-932][API-933][wifi] fix memory leak of lynq_get_connect_ap_rssi

Change-Id: Ic2b9a04658761e2c6674791ccc8631aef1a0179f
diff --git a/lib/liblynq-wifi6/libwifi6.c b/lib/liblynq-wifi6/libwifi6.c
index 39314d2..45a957d 100755
--- a/lib/liblynq-wifi6/libwifi6.c
+++ b/lib/liblynq-wifi6/libwifi6.c
@@ -3106,24 +3106,16 @@
 
 //    *rssi = atoi(split_words[1]) * -1;
 
-    FILE *fp;
-    size_t i = 0;
     char lynq_cmd_ret[MAX_RET]={0};
 
-//    CHECK_IDX(idx, CTRL_AP);
 /*******change other cmd to get rssi*******
  *
  *wl rssi ---> wl -i wlan0 rssi
  *
  ***** change by qs.xiong 20221011*******/
-    if((fp=popen("wl -i wlan0 rssi","r"))==NULL)
+    if (0 !=  exec_cmd("wl -i wlan0 rssi", lynq_cmd_ret, MAX_RET))
     {
-        perror("popen error!");
-        return -1;
-    }
-    if((fread(lynq_cmd_ret,sizeof(lynq_cmd_ret),1,fp))<0)
-    {
-        perror("fread fail!");
+        RLOGE("[lynq_get_connect_ap_rssi] exec cmd [ wl -i wlan0 rssi ] fail");
         return -1;
     }
     *rssi = atoi(lynq_cmd_ret) * -1;
@@ -3131,7 +3123,7 @@
     if(*rssi == 0)
     {
         RLOGE("[lynq_get_connect_ap_rssi]sta didn't connected any ap device,please check connection\n");
-	return -1;
+        return -1;
     }
 
     return 0;