fix unhandled switch/case warning

diff --git a/src/mesa/pipe/softpipe/sp_prim_setup.c b/src/mesa/pipe/softpipe/sp_prim_setup.c
index b3c9f51..e7b58e5 100644 (file)
--- a/src/mesa/pipe/softpipe/sp_prim_setup.c
+++ b/src/mesa/pipe/softpipe/sp_prim_setup.c
@@ -717,6 +717,10 @@ setup_line_coefficients(struct setup_stage *setup, struct prim_header *prim)
         for (j = 0; j < NUM_CHANNELS; j++)
            line_persp_coeff(setup, slot, j);
         break;
+
+      default:
+         /* invalid interp mode */
+         assert(0);
       }
    }
 }