riched20: Don't return the diTextStart paragraph from para_prev().

dlls/riched20/caret.c

@@ -774,12 +774,10 @@ ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
         {
           para = run->para;
           /* Skip empty start of table row paragraph */
-          if (para_prev( para )->nFlags & MEPF_ROWSTART)
+          if (para_prev( para ) && para_prev( para )->nFlags & MEPF_ROWSTART)
             para = para_prev( para );
           /* Paragraph breaks are treated as separate words */
-          if (para_get_di( para_prev( para ) )->type == diTextStart)
-            return FALSE;
-
+          if (!para_prev( para )) return FALSE;
           para = para_prev( para );
           run = para_end_run( para );
         }

dlls/riched20/para.c

@@ -64,7 +64,7 @@ ME_Paragraph *para_next( ME_Paragraph *para )
 
 ME_Paragraph *para_prev( ME_Paragraph *para )
 {
-    if (para->prev_para) return &para->prev_para->member.para;
+    if (para->prev_para && para->prev_para->type == diParagraph) return &para->prev_para->member.para;
     return NULL;
 }