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Avoid using NULL in non-pointer contexts: use 0 for integer values and '\0'
for chars.
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@ -52,7 +52,7 @@ cmd_display_message_exec(struct cmd *self, struct cmd_ctx *ctx)
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if ((c = cmd_find_client(ctx, args_get(args, 'c'))) == NULL)
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return (-1);
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if (args_has(args, 't') != NULL) {
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if (args_has(args, 't') != 0) {
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wl = cmd_find_pane(ctx, args_get(args, 't'), &s, &wp);
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if (wl == NULL)
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return (-1);
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