swrast: silence unused var warnings

Signed-off-by: Brian Paul <brianp@vmware.com>

diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index db102ac..9a91be3 100644 (file)
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -212,10 +212,10 @@ interpolate_active_attribs(struct gl_context *ctx, SWspan *span, GLbitfield attr
 static INLINE void
 interpolate_int_colors(struct gl_context *ctx, SWspan *span)
 {
+#if CHAN_BITS != 32
    const GLuint n = span->end;
    GLuint i;
 
-#if CHAN_BITS != 32
    ASSERT(!(span->arrayMask & SPAN_RGBA));
 #endif