Putting tex-math-face in tex group

[Arash Esbati]

Hi all,

tex-math-face defined in tex-font.el doesn't specify a custom group.
Any objections if I apply this patch in order to pacify the compiler?

    diff --git a/tex-font.el b/tex-font.el
    index 27c9cf2c..cdedc427 100644
    --- a/tex-font.el
    +++ b/tex-font.el
    @@ -148,7 +148,8 @@

     (defface tex-math-face
       '((t :inherit font-lock-string-face))
    -  "Face used to highlight TeX math expressions.")
    +  "Face used to highlight TeX math expressions."
    +  :group 'tex)
     (defvar tex-math-face 'tex-math-face)

 ;; Use string syntax but math face for $...$.

Best, Arash