Lots of clean-up in arb program parser.
Use new _mesa_init_fp/vp_instruction() function to initialize instructions.
diff --git a/src/mesa/shader/nvvertparse.c b/src/mesa/shader/nvvertparse.c
index 33bc200..c48a4cb 100644
--- a/src/mesa/shader/nvvertparse.c
+++ b/src/mesa/shader/nvvertparse.c
@@ -1142,11 +1142,7 @@
       struct vp_instruction *inst = program + parseState->numInst;
 
       /* Initialize the instruction */
-      inst->SrcReg[0].File = PROGRAM_UNDEFINED;
-      inst->SrcReg[1].File = PROGRAM_UNDEFINED;
-      inst->SrcReg[2].File = PROGRAM_UNDEFINED;
-      inst->DstReg.File = PROGRAM_UNDEFINED;
-      inst->Data = NULL;
+      _mesa_init_vp_instruction(inst);
 
       if (Parse_String(parseState, "MOV")) {
          if (!Parse_UnaryOpInstruction(parseState, inst, VP_OPCODE_MOV))
@@ -1601,3 +1597,22 @@
    ASSERT(i < MAX_NV_VERTEX_PROGRAM_OUTPUTS);
    return OutputRegisters[i];
 }
+
+
+/**
+ * Initialize vertex program instruction fields to defaults.
+ */
+void
+_mesa_init_vp_instruction(struct vp_instruction *inst)
+{
+   _mesa_bzero(inst, sizeof(struct vp_instruction));
+   inst->SrcReg[0].File = PROGRAM_UNDEFINED;
+   inst->SrcReg[0].Swizzle = SWIZZLE_NOOP;
+   inst->SrcReg[1].File = PROGRAM_UNDEFINED;
+   inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
+   inst->SrcReg[2].File = PROGRAM_UNDEFINED;
+   inst->SrcReg[2].Swizzle = SWIZZLE_NOOP;
+   inst->DstReg.File = PROGRAM_UNDEFINED;
+   inst->DstReg.WriteMask = 0xf;
+}
+