patch 7.4.916

Problem:    When running out of memory while copying a dict memory may be
            freed twice. (ZyX)
Solution:   Do not call the garbage collector when running out of memory.

src/misc2.c

@@ -952,9 +952,6 @@ lalloc(size, message)
 
 	clear_sb_text();	      /* free any scrollback text */
 	try_again = mf_release_all(); /* release as many blocks as possible */
-#ifdef FEAT_EVAL
-	try_again |= garbage_collect(); /* cleanup recursive lists/dicts */
-#endif
 
 	releasing = FALSE;
 	if (!try_again)