softpipe: (trivial) fix debug code

The debug printfs wouldn't actually compile when enabled, so kill them off
and insert some new one in another place, and make sure it keeps compiling
by enclosing it in a if-0 clause.

src/gallium/drivers/softpipe/sp_setup.c

@@ -511,14 +511,6 @@ tri_linear_coeff(struct setup_context *setup,
    coef->a0[i] = (v[0] -
                   (dadx * (setup->vmin[0][0] - setup->pixel_offset) +
                    dady * (setup->vmin[0][1] - setup->pixel_offset)));
-
-   /*
-   debug_printf("attr[%d].%c: %f dx:%f dy:%f\n",
-		slot, "xyzw"[i],
-		setup->coef[slot].a0[i],
-		setup->coef[slot].dadx[i],
-		setup->coef[slot].dady[i]);
-   */
 }
 
 
@@ -549,13 +541,6 @@ tri_persp_coeff(struct setup_context *setup,
    float dadx = a * setup->oneoverarea;
    float dady = b * setup->oneoverarea;
 
-   /*
-   debug_printf("tri persp %d,%d: %f %f %f\n", vertSlot, i,
-          	setup->vmin[vertSlot][i],
-          	setup->vmid[vertSlot][i],
-       		setup->vmax[vertSlot][i]
-          );
-   */
    assert(i <= 3);
 
    coef->dadx[i] = dadx;
@@ -668,6 +653,16 @@ setup_tri_coefficients(struct setup_context *setup)
          setup->coef[fragSlot].dadx[0] = 0.0;
          setup->coef[fragSlot].dady[0] = 0.0;
       }
+
+      if (0) {
+         for (j = 0; j < TGSI_NUM_CHANNELS; j++) {
+            debug_printf("attr[%d].%c: a0:%f dx:%f dy:%f\n",
+                         fragSlot, "xyzw"[j],
+                         setup->coef[fragSlot].a0[j],
+                         setup->coef[fragSlot].dadx[j],
+                         setup->coef[fragSlot].dady[j]);
+         }
+      }
    }
 }