don't call (sql-mode) to invalid Org Babel source block [C-c '] to exit

[stardiviner]

ejc-configure-sql-buffer will execute (sql-mode). change Babel source block `major-mode'. Then when I press [C-c '] to exist sql source block will be invalid.

add a if condition to detect whether current buffer is in source block editing dedicate buffer. Because SQL source block is sql-mode already, so no need to invoke sql-mode again.

(defun ejc-configure-sql-buffer (product-name)
  (unless (org-src-edit-buffer-p)
    (sql-mode))
  (sql-set-product (or (cdr (assoc-string product-name ejc-product-assoc))
                       (car (assoc-string product-name sql-product-alist))
                       "ansi"))
  (auto-complete-mode t)
  (auto-fill-mode t)
  (ejc-sql-mode)
  (ejc-sql-mode t))

If you accept this patch, I will add an PR.

[kostafey]

It's ok, please add Pull request for it.