autosuggest: Fix segment fault when type long word

Summary:
It need a space more for adding a charater.
e.g. line 434..

Test Plan:
1. open suggest list in code file using <Ctrl> + <Space>.
2. type some long word.
e.g. 'evas_object_smart_callback_add'
3. Check there is no segment fault.

Reviewers: ajwillia.ms

Differential Revision: https://phab.enlightenment.org/D4562

src/bin/editor/edi_editor.c

@@ -92,10 +92,10 @@ _edi_editor_current_word_get(Edi_Editor *editor, unsigned int row, unsigned int
           *(ptr - 1) == '_'))
      ptr--;
 
-   wordlen = col - (ptr - curtext) - 1;
+   wordlen = col - (ptr - curtext);
    curword = malloc(sizeof(char) * (wordlen + 1));
    strncpy(curword, ptr, wordlen);
-   curword[wordlen] = '\0';
+   curword[wordlen - 1] = '\0';
 
    return curword;
 }