util: make use of isempty() where appropriate
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@ -695,7 +695,7 @@ int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char *
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}
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/* Kernel threads have no argv[] */
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if (r == NULL || r[0] == 0) {
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if (isempty(r)) {
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_cleanup_free_ char *t = NULL;
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int h;
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