print: Fix default buffer size in printbuffer
print: Fix default buffer size in printbuffer

Thanks @liuyunbin for reporting this in #230

FSMaxB/cJSON,FSMaxB/cJSON,FSMaxB/cJSON,DaveGamble/cJSON,FSMaxB/cJSON,DaveGamble/cJSON,DaveGamble/cJSON,DaveGamble/cJSON,FSMaxB/cJSON