r300g: only allow byteswapped formats on big endian

They cause regressions on little endian.

Fixes: 172bfdaa9e ("r300g: add support for PIPE_FORMAT_x8R8G8B8_*")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98869
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/drivers/r300/r300_texture.c

@@ -47,6 +47,11 @@
  */
 static enum pipe_format r300_unbyteswap_array_format(enum pipe_format format)
 {
+    /* FIXME: Disabled on little endian because of a reported regression:
+     * https://bugs.freedesktop.org/show_bug.cgi?id=98869 */
+    if (PIPE_ENDIAN_NATIVE != PIPE_ENDIAN_BIG)
+        return format;
+
     /* Only BGRA 8888 array formats are supported for simplicity of
      * the implementation. */
     switch (format) {