swrast: fix undefined shift of 1 << 31

Pointed out by coverity

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index f50b549a97fe6c8849a6bdbaf9293ed79a57a381..184a37c99b810c1459e8639e755e7cc981c155c9 100644 (file)
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -769,7 +769,7 @@ clip_span( struct gl_context *ctx, SWspan *span )
           * For arrays of values, shift them left.
           */
          for (i = 0; i < VARYING_SLOT_MAX; i++) {
-            if (span->interpMask & (1 << i)) {
+            if (span->interpMask & (1u << i)) {
                GLuint j;
                for (j = 0; j < 4; j++) {
                   span->attrStart[i][j] += leftClip * span->attrStepX[i][j];