fold-delete-marker SEGV fix

[Lech Lorens]

Problem:
The cursor position is not updated after deleting a fold based on
markers. This results in an invalid memory reference in some scenarios.

How to reproduce:
In normal mode perform zRgg$zdaa while editing a file with the following
contents:
[[[
blah blah blah
]]]
vim: fdm=marker fmr=[[[,]]]

Fix:
The attached patch seems to fix the problem.

-- 
Cheers,
Lech

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*** src/.svn/text-base/fold.c.svn-base	2008-12-01 00:34:32.000000000 +0100
--- src/fold.c	2008-12-18 00:41:52.000000000 +0100
***************
*** 748,753 ****
--- 748,754 ----
      int		did_one = FALSE;
      linenr_T	first_lnum = MAXLNUM;
      linenr_T	last_lnum = 0;
+     colnr_T	len;
  
      checkupdate(curwin);
  
***************
*** 802,807 ****
--- 803,814 ----
  	    changed_window_setting();
  	}
      }
+     len = (colnr_T)STRLEN(ml_get_curline());
+     if(curwin->w_cursor.col >= len)
+     {
+ 	curwin->w_cursor.col = (colnr_T)(len? len - 1: 0);
+ 	changed_cline_bef_curs();
+     }
      if (!did_one)
      {
  	EMSG(_(e_nofold));