Fix error string

src/mesa/shader/prog_execute.c

@@ -1520,8 +1520,9 @@ _mesa_execute_program(GLcontext * ctx,
       case OPCODE_END:
          return GL_TRUE;
       default:
-         _mesa_problem(ctx, "Bad opcode %d in _mesa_exec_fragment_program",
+         _mesa_problem(ctx, "Bad opcode %d in _mesa_execute_program",
                        inst->Opcode);
+		       assert(0);
          return GL_TRUE;        /* return value doesn't matter */
 
       }