hal: fix input validation errors

 -Fix input validation error 721588

Change-Id: Iaf14581732a5216f7a72272ddd4db2cd0ceba420
diff --git a/hal/msm8916/platform.c b/hal/msm8916/platform.c
index b41e040..6309ce2 100644
--- a/hal/msm8916/platform.c
+++ b/hal/msm8916/platform.c
@@ -3587,6 +3587,8 @@
     char *kv_pairs = NULL;
 
     kv_pairs = str_parms_to_str(parms);
+    if(!kv_pairs)
+        return ret;
     len = strlen(kv_pairs);
     ALOGV("%s: enter: - %s", __func__, kv_pairs);
     free(kv_pairs);