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Fix OOB while reading bar input.
If the status bar script returns NUL as the first character through stdin, spectrwm is prone to an out of boundary access. Depending on the memory layout of the machine, it could turn into an OOB write. The fix is simple: If the string is empty, do not further check for newline character. Signed-off-by: Tobias Stoeckmann <email@example.com>
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