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The function assumed that the raw output of "adb get-serialno" was a NUL-terminated string, but it is not the case. It this output did not end with a space or a new line character, then sc_str_truncate() would write '\0' over the last character. Even worse, if the output was empty, then sc_str_truncate() would write out-of-bounds. Avoid the error-prone sc_str_truncate() util function.