r200: Fix probable thinko in r200EmitArrays

Effectively this path would always assert.  Move the break statement to
the (probable) intended place.

Note: This is a candidate for the stable branches.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
(cherry picked from commit 06f3a1f792)

src/mesa/drivers/dri/r200/r200_maos_arrays.c

@@ -166,8 +166,9 @@ void r200EmitArrays( struct gl_context *ctx, GLubyte *vimap_rev )
 	       /* fallthrough */
 	    case 4:
 	       vfmt0 |= R200_VTX_W1;
-	    break;
+	       /* fallthrough */
 	    }
+	    break;
 	 default:
 	    assert(0);
 	    emitsize = 0;