cpu/esp_common: esp_now doesn't call memcpy if iol_len is 0
cpu/esp_common: esp_now doesn't call memcpy if iol_len is 0


jasonatran/RIOT,smlng/RIOT,yogo1212/RIOT,kYc0o/RIOT,kYc0o/RIOT,rfuentess/RIOT,mtausig/RIOT,authmillenon/RIOT,authmillenon/RIOT,smlng/RIOT,kaspar030/RIOT,miri64/RIOT,smlng/RIOT,OlegHahm/RIOT,miri64/RIOT,josephnoir/RIOT,mfrey/RIOT,RIOT-OS/RIOT,miri64/RIOT,authmillenon/RIOT,OTAkeys/RIOT,toonst/RIOT,OlegHahm/RIOT,josephnoir/RIOT,kaspar030/RIOT,jasonatran/RIOT,jasonatran/RIOT,basilfx/RIOT,basilfx/RIOT,ant9000/RIOT,ant9000/RIOT,rfuentess/RIOT,mtausig/RIOT,jasonatran/RIOT,aeneby/RIOT,x3ro/RIOT,x3ro/RIOT,yogo1212/RIOT,yogo1212/RIOT,authmillenon/RIOT,mtausig/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,authmillenon/RIOT,x3ro/RIOT,cladmi/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,smlng/RIOT,jasonatran/RIOT,kaspar030/RIOT,cladmi/RIOT,rfuentess/RIOT,josephnoir/RIOT,OTAkeys/RIOT,authmillenon/RIOT,miri64/RIOT,OlegHahm/RIOT,mfrey/RIOT,cladmi/RIOT,ant9000/RIOT,josephnoir/RIOT,lazytech-org/RIOT,x3ro/RIOT,cladmi/RIOT,OlegHahm/RIOT,toonst/RIOT,rfuentess/RIOT,aeneby/RIOT,aeneby/RIOT,rfuentess/RIOT,x3ro/RIOT,lazytech-org/RIOT,lazytech-org/RIOT,RIOT-OS/RIOT,mtausig/RIOT,smlng/RIOT,kaspar030/RIOT,OTAkeys/RIOT,kYc0o/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,basilfx/RIOT,basilfx/RIOT,kaspar030/RIOT,ant9000/RIOT,yogo1212/RIOT,miri64/RIOT,lazytech-org/RIOT,kYc0o/RIOT,toonst/RIOT,mtausig/RIOT,ant9000/RIOT,aeneby/RIOT,basilfx/RIOT,mfrey/RIOT,cladmi/RIOT,mfrey/RIOT,toonst/RIOT,toonst/RIOT,kYc0o/RIOT,aeneby/RIOT,mfrey/RIOT,OTAkeys/RIOT,lazytech-org/RIOT,OlegHahm/RIOT