From aea31e85f6c2718e5fb4b3cf41462f31889b19eb Mon Sep 17 00:00:00 2001
From: Armel FAUVEAU <armel.fauveau@globalis-ms.com>
Date: Tue, 2 Jul 2024 02:01:50 +0200
Subject: [PATCH] Fix pull request #152

---
 app/spectrum.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/app/spectrum.c b/app/spectrum.c
index c5383cc..3edecc0 100644
--- a/app/spectrum.c
+++ b/app/spectrum.c
@@ -671,9 +671,10 @@ static void Blacklist() {
 #ifdef ENABLE_SCAN_RANGES
 static bool IsBlacklisted(uint16_t idx)
 {
-  for(uint8_t i = 0; i < ARRAY_SIZE(blacklistFreqs); i++)
-    if(blacklistFreqs[i] == idx)
-      return true;
+  if(blacklistFreqs[0]) // cheaper than checking blacklistFreqsIdx
+    for(uint8_t i = 0; i < ARRAY_SIZE(blacklistFreqs); i++)
+      if(blacklistFreqs[i] == idx)
+        return true;
   return false;
 }
 #endif