ir_constant_expression: Fix loop increments.
diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp
index 98cbb6c..0fe93ad 100644
--- a/src/glsl/ir_constant_expression.cpp
+++ b/src/glsl/ir_constant_expression.cpp
@@ -149,8 +149,8 @@
    /* When iterating over a vector or matrix's components, we want to increase
     * the loop counter.  However, for scalars, we want to stay at 0.
     */
-   unsigned c0_inc = op0_scalar ? 1 : 0;
-   unsigned c1_inc = op1_scalar ? 1 : 0;
+   unsigned c0_inc = op0_scalar ? 0 : 1;
+   unsigned c1_inc = op1_scalar ? 0 : 1;
    unsigned components;
    if (op1_scalar || !op[1]) {
       components = op[0]->type->components();