ob-core: Fix Invalid search bound (wrong side of point)

* lisp/ob-core.el (org-babel-where-is-src-block-result): Return nil when
  anonymous results would be located outside of the container of the
  source block.

* testing/lisp/test-ob.el (test-ob/where-is-src-block-result): Add test.

Reported-by: Dominik Schrempf <dominik.schrempf@gmail.com>
<http://permalink.gmane.org/gmane.emacs.orgmode/105309>

lisp/ob-core.el

@@ -1962,11 +1962,16 @@ to HASH."
 	     ;; Named results expect but none to be found.
 	     (name)
 	     ;; No possible anonymous results at the very end of
-	     ;; buffer.
-	     ((eobp))
+	     ;; buffer or outside CONTEXT parent.
+	     ((eq (point)
+		  (or (org-element-property
+		       :contents-end (org-element-property :parent context))
+		      (point-max))))
 	     ;; Check if next element is an anonymous result below
 	     ;; the current block.
-	     ((let* ((next (org-element-at-point))
+	     ((let* ((next (save-excursion
+			     (skip-chars-forward " \t\n")
+			     (org-element-at-point)))
 		     (end (save-excursion
 			    (goto-char
 			     (org-element-property :post-affiliated next))

testing/lisp/test-ob.el

@@ -1623,6 +1623,10 @@ echo \"$data\"
   (should-not
    (org-test-with-temp-text "#+BEGIN_SRC emacs-lisp\n(+ 1 1)\n#+END_SRC"
      (org-babel-where-is-src-block-result)))
+  (should-not
+   (org-test-with-temp-text
+       "- item\n  #+BEGIN_SRC emacs-lisp\n(+ 1 1)\n#+END_SRC\n\n"
+     (org-babel-where-is-src-block-result)))
   ;; When optional argument INSERT is non-nil, add RESULTS keyword
   ;; whenever no RESULTS can be found.
   (should