Commit 58ac439bc for imagemagick.org

commit 58ac439bc14d882902a5d7db5eb50f589751c8f2
Author: Cristy <urban-warrior@imagemagick.org>
Date:   Sat Oct 17 13:32:52 2026 -0400

    https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-6xcw-8jvx-wh63

diff --git a/MagickCore/quantum.c b/MagickCore/quantum.c
index 6fe83588e..f66e17143 100644
--- a/MagickCore/quantum.c
+++ b/MagickCore/quantum.c
@@ -323,6 +323,7 @@ MagickExport size_t GetQuantumExtent(const Image *image,
     case RGBAQuantum: channels=4; break;
     case RGBOQuantum: channels=4; break;
     case BGRAQuantum: channels=4; break;
+    case BGROQuantum: channels=4; break;
     case CMYKQuantum: channels=4; break;
     case CMYKAQuantum: channels=5; break;
     case MultispectralQuantum: channels=GetImageChannels(image); break;