glsl: fix uninitialised variable from constructor

Coverity pointed out this uninitialised class member.

Note: This is a candidate for stable branches.

Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/glsl/ir_function_detect_recursion.cpp

@@ -173,6 +173,7 @@ public:
    has_recursion_visitor()
       : current(NULL)
    {
+      progress = false;
       this->mem_ctx = ralloc_context(NULL);
       this->function_hash = hash_table_ctor(0, hash_table_pointer_hash,
 					    hash_table_pointer_compare);