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`$(( ))` will convert uninitialized variable to "0". If we want to
use "-n" to check the string length, it's necessary to make sure the
converted variable is not empty.
Fixes:
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|---|---|---|
| .. | ||
| base-files | ||
| boot | ||
| devel | ||
| firmware | ||
| kernel | ||
| libs | ||
| network | ||
| system | ||
| utils | ||
| Makefile | ||