glsl2: Create new talloc contexts the "right" way.

src/glsl/ir_copy_propagation.cpp

@@ -225,7 +225,7 @@ copy_propagation_basic_block(ir_instruction *first,
    bool *out_progress = (bool *)data;
    bool progress = false;
 
-   void *ctx = talloc(NULL, void*);
+   void *ctx = talloc_new(NULL);
    for (ir = first;; ir = (ir_instruction *)ir->next) {
       ir_assignment *ir_assign = ir->as_assignment();
 

src/glsl/ir_dead_code_local.cpp

@@ -185,7 +185,7 @@ dead_code_local_basic_block(ir_instruction *first,
    bool *out_progress = (bool *)data;
    bool progress = false;
 
-   void *ctx = talloc(NULL, void*);
+   void *ctx = talloc_new(NULL);
    /* Safe looping, since process_assignment */
    for (ir = first, ir_next = (ir_instruction *)first->next;;
 	ir = ir_next, ir_next = (ir_instruction *)ir->next) {