[Bugfix][API-1133][wifi]fix api lynq_get_ip_by_mac get ipv4 addrrs

Change-Id: I0e686e9f60caf1599c2e023089e26419de9bc045
diff --git a/lib/liblynq-wifi6/libwifi6.c b/lib/liblynq-wifi6/libwifi6.c
index ed4024c..d15072d 100755
--- a/lib/liblynq-wifi6/libwifi6.c
+++ b/lib/liblynq-wifi6/libwifi6.c
@@ -1101,7 +1101,7 @@
     if (NULL == mac || NULL == ip)
         return -1;
     memset(ip, 0, ip_len);
-    sprintf(cmd, "ip n s | grep \"lladdr\" | grep \"%s\" | head -1 | awk '{print $1}'", mac);
+    sprintf(cmd, "ip n s | grep \"lladdr\" | grep \"%s\" | awk '{print $1}' | grep -v \":\" | head -1", mac);
     ret = exec_cmd(cmd, ip, ip_len);
     p = strchr(ip, '\n');
     if (NULL != p)