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patch 8.0.1496: clearing a pointer takes two lines
Problem: Clearing a pointer takes two lines.
Solution: Add VIM_CLEAR() and replace vim_clear(). (Hirohito Higashi,
closes #2629)
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@@ -1619,8 +1619,7 @@ mch_getenv(char_u *var)
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else
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#endif
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{
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vim_free(alloced);
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alloced = NULL;
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VIM_CLEAR(alloced);
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retval = NULL;
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buf = alloc(IOSIZE);
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