richedit: Simplified the character length delete protection.

[Dylan Smith]

The value for nMaxChars can be found easier by using ME_GetTextLength.
---
 dlls/riched20/caret.c |   10 ++--------
 1 files changed, 2 insertions(+), 8 deletions(-)
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diff --git a/dlls/riched20/caret.c b/dlls/riched20/caret.c
index cdd8f79..7bdd0a7 100644
--- a/dlls/riched20/caret.c
+++ b/dlls/riched20/caret.c
@@ -273,14 +273,8 @@ BOOL ME_InternalDeleteText(ME_TextEditor *editor, int nOfs, int nChars,
   int totalChars = nChars;
   ME_DisplayItem *start_para;
 
-  {
-    /* Prevent deletion past last end of paragraph run. */
-    ME_DisplayItem *pTextEnd = editor->pBuffer->pLast;
-    int nMaxChars = pTextEnd->member.para.prev_para->member.para.nCharOfs;
-    nMaxChars += ME_FindItemBack(pTextEnd, diRun)->member.run.nCharOfs;
-    nMaxChars -= nOfs;
-    nChars = min(nChars, nMaxChars);
-  }
+  /* Prevent deletion past last end of paragraph run. */
+  nChars = min(nChars, ME_GetTextLength(editor) - nOfs);
 
   ME_CursorFromCharOfs(editor, nOfs, &c);
   start_para = ME_GetParagraph(c.pRun);