tone-player: Fix asan defect (stack-buffer-underflow)

tone-player: Fix asan defect (stack-buffer-underflow)

==pulseaudio==799==ERROR: AddressSanitizer: stack-buffer-underflow on address 0xbdc65da0 at pc 0xb5c397ad bp 0xbdc60db0 sp 0xbdc60e00
READ of size 22 at 0xbdc65da0 thread T0
    #0 0xb5c397aa in printf_common(void*, char const*, std::__va_list) (/usr/lib/libasan.so+0x757aa)
    #1 0xb5c3b11c in vsnprintf (/usr/lib/libasan.so+0x7711c)
    #2 0xb58ca3ba in pa_vsnprintf (/usr/lib/pulseaudio/libpulsecommon-13.0.so+0x4a3ba)
    #3 0xb58ddcd8 in pa_log_levelv_meta (/usr/lib/pulseaudio/libpulsecommon-13.0.so+0x5dcd8)
    #4 0xb58dd5c6 in pa_log_level_meta (/usr/lib/pulseaudio/libpulsecommon-13.0.so+0x5d5c6)
    #5 0xb2e262d8 in module_tone_player_LTX_pa__init (/usr/lib/pulse-13.0/modules/module-tone-player.so+0x22d8)
    #6 0xb5ab7072 in pa_module_load (/usr/lib/pulseaudio/libpulsecore-13.0.so+0x56072)
    #7 0xb5a9818e in pa_cli_command_load (/usr/lib/pulseaudio/libpulsecore-13.0.so+0x3718e)
    #8 0xb5aa06b2 in pa_cli_command_execute_line_stateful (/usr/lib/pulseaudio/libpulsecore-13.0.so+0x3f6b2)
    #9 0xb5aa11c4 in pa_cli_command_execute_file_stream (/usr/lib/pulseaudio/libpulsecore-13.0.so+0x401c4)
    #10 0x1810a in main (/usr/bin/pulseaudio+0x1810a)
    #11 0xb5440c80 in __libc_start_main (/lib/libc.so.6+0x1ac80)

[Version] 13.0.41
[Issue Type] Bug

Change-Id: Ib0c1987d14ac42d47b7e6036b12c1313b275b151