panfrost: Simplify AFBC format check

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5484>
diff --git a/src/panfrost/encoder/pan_afbc.c b/src/panfrost/encoder/pan_afbc.c
index 272a713..f1f62ba 100644
--- a/src/panfrost/encoder/pan_afbc.c
+++ b/src/panfrost/encoder/pan_afbc.c
@@ -92,7 +92,12 @@
         if (util_format_is_rgba8_variant(desc))
                 return true;
 
-        /* List some special formats */
+        /* Only Z24S8 variants are compressible as Z/S */
+
+        if (panfrost_is_z24s8_variant(format))
+                return true;
+
+        /* Lookup special formats */
         switch (format) {
         case PIPE_FORMAT_R8G8B8_UNORM:
         case PIPE_FORMAT_B8G8R8_UNORM:
@@ -100,17 +105,8 @@
         case PIPE_FORMAT_B5G6R5_UNORM:
                 return true;
         default:
-                break;
+                return false;
         }
-
-        /* Only Z24S8 variants are compressible as Z/S */
-
-        if (panfrost_is_z24s8_variant(format))
-                return true;
-
-        /* TODO: AFBC of other formats */
-
-        return false;
 }
 
 unsigned