fixed bug in size-calculation of coap_new_error_response() (applied patch from Thomas Stammeier)
fixed bug in size-calculation of coap_new_error_response() (applied patch from Thomas Stammeier)

The calculation of required space for textual error phrase did not take into account the one
byte for the payload start marker.

thecodemaiden/libcoap-fork,gebart/libcoap,nmacs/libcoap,fredericgermain/libcoap,gebart/libcoap,RIOT-OS/libcoap,OlegHahm/libcoap,pabigot/libcoap,PolymorhicCode/libcoap,authmillenon/libcoap,joaopedrotaveira/libcoap,thecodemaiden/libcoap-fork,nmacs/libcoap,OlegHahm/libcoap,joaopedrotaveira/libcoap,RIOT-OS/libcoap,pabigot/libcoap,alexaring/libcoap,sgso/libcoap,fredericgermain/libcoap,joaopedrotaveira/libcoap,sgso/libcoap,nmacs/libcoap,sgso/libcoap,fredericgermain/libcoap,gebart/libcoap,authmillenon/libcoap,pabigot/libcoap,OlegHahm/libcoap,alexaring/libcoap,alexaring/libcoap,authmillenon/libcoap