strjoin(): Fix behavior if output buffer is NULL. #3063
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Additionally, test the (NULL, 0) output buffer for all test cases rather than an individual, isolated test case. Fixes: collectd#3062
rubenk
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This reverts commit 3b48e3a.
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Additionally, test the (NULL, 0) output buffer for all test cases rather
than an individual, isolated test case.
Fixes: #3062
ChangeLog: collectd: An invalid memory access in the
strjoin()function has been fixed.