glsl: Initialize ast_node member field location.path in constructor.
Fix defect reported by Coverity Scan.
Uninitialized pointer field (UNINIT_CTOR) uninit_member: Non-static class member field location.path is not initialized in this constructor nor in any functions that it calls.
Signed-off-by: Vinson Lee vlee@freedesktop.org
cc: @tarceri