nv50/ir: Initialize Source members.

Fix defects reported by Coverity Scan.

uninit_member: Non-static class member insns is not initialized in this
constructor nor in any functions that it calls.
uninit_member: Non-static class member clipVertexOutput is not
initialized in this constructor nor in any functions that it calls.

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6769>

src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp

@@ -1056,7 +1056,7 @@ private:
 
 Source::Source(struct nv50_ir_prog_info *info, struct nv50_ir_prog_info_out *info_out,
                nv50_ir::Program *prog)
-:  info(info), info_out(info_out), prog(prog)
+:  insns(NULL), info(info), info_out(info_out), clipVertexOutput(-1), prog(prog)
 {
    tokens = (const struct tgsi_token *)info->bin.source;
 
@@ -1088,8 +1088,6 @@ bool Source::scanSource()
    if (!insns)
       return false;
 
-   clipVertexOutput = -1;
-
    textureViews.resize(scan.file_max[TGSI_FILE_SAMPLER_VIEW] + 1);
    //resources.resize(scan.file_max[TGSI_FILE_RESOURCE] + 1);
    tempArrayId.resize(scan.file_max[TGSI_FILE_TEMPORARY] + 1);