mesa: Don't add 1 to GL_ACTIVE_UNIFORM_MAX_LENGTH.

Fixes: glsl-getactiveuniform-length.

src/mesa/main/shaderapi.c

@@ -644,8 +644,6 @@ get_programiv(GLcontext *ctx, GLuint program, GLenum pname, GLint *params)
       break;
    case GL_ACTIVE_UNIFORM_MAX_LENGTH:
       *params = _mesa_longest_uniform_name(shProg->Uniforms);
-      if (*params > 0)
-         (*params)++;  /* add one for terminating zero */
       break;
    case GL_PROGRAM_BINARY_LENGTH_OES:
       *params = 0;