cpu/lpc2387: Fixed invalid call to send_msg in lpc2387-mci.c
cpu/lpc2387: Fixed invalid call to send_msg in lpc2387-mci.c

At `lpc2387-mci.c:383` in `send_cmd()` an `assert()` enforces that parameter
`buff` is not `NULL`. At `lpc2387-mci.c:538` in `mci_initialize()` `send_cmd()`
was called with `buff==NULL`.

toonst/RIOT,gebart/RIOT,yogo1212/RIOT,josephnoir/RIOT,biboc/RIOT,avmelnikoff/RIOT,kYc0o/RIOT,OTAkeys/RIOT,authmillenon/RIOT,kaspar030/RIOT,yogo1212/RIOT,BytesGalore/RIOT,basilfx/RIOT,kaspar030/RIOT,mfrey/RIOT,OlegHahm/RIOT,jasonatran/RIOT,A-Paul/RIOT,ant9000/RIOT,x3ro/RIOT,toonst/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,miri64/RIOT,kbumsik/RIOT,cladmi/RIOT,smlng/RIOT,aeneby/RIOT,mfrey/RIOT,jasonatran/RIOT,smlng/RIOT,lazytech-org/RIOT,mfrey/RIOT,lazytech-org/RIOT,A-Paul/RIOT,cladmi/RIOT,lazytech-org/RIOT,rfuentess/RIOT,A-Paul/RIOT,lazytech-org/RIOT,toonst/RIOT,avmelnikoff/RIOT,avmelnikoff/RIOT,authmillenon/RIOT,A-Paul/RIOT,mtausig/RIOT,neiljay/RIOT,ant9000/RIOT,biboc/RIOT,smlng/RIOT,rfuentess/RIOT,neiljay/RIOT,BytesGalore/RIOT,x3ro/RIOT,kYc0o/RIOT,aeneby/RIOT,avmelnikoff/RIOT,basilfx/RIOT,kbumsik/RIOT,ant9000/RIOT,aeneby/RIOT,RIOT-OS/RIOT,neiljay/RIOT,OlegHahm/RIOT,miri64/RIOT,kbumsik/RIOT,kaspar030/RIOT,smlng/RIOT,neiljay/RIOT,rfuentess/RIOT,gebart/RIOT,jasonatran/RIOT,yogo1212/RIOT,BytesGalore/RIOT,gebart/RIOT,OlegHahm/RIOT,neiljay/RIOT,kaspar030/RIOT,x3ro/RIOT,josephnoir/RIOT,kYc0o/RIOT,rfuentess/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,kaspar030/RIOT,mtausig/RIOT,mtausig/RIOT,jasonatran/RIOT,toonst/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,miri64/RIOT,josephnoir/RIOT,basilfx/RIOT,ant9000/RIOT,toonst/RIOT,josephnoir/RIOT,cladmi/RIOT,A-Paul/RIOT,cladmi/RIOT,OlegHahm/RIOT,kYc0o/RIOT,basilfx/RIOT,aeneby/RIOT,gebart/RIOT,mtausig/RIOT,yogo1212/RIOT,biboc/RIOT,cladmi/RIOT,basilfx/RIOT,jasonatran/RIOT,smlng/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,kbumsik/RIOT,OTAkeys/RIOT,gebart/RIOT,authmillenon/RIOT,kbumsik/RIOT,miri64/RIOT,mfrey/RIOT,mtausig/RIOT,biboc/RIOT,mfrey/RIOT,OTAkeys/RIOT,kYc0o/RIOT,avmelnikoff/RIOT,lazytech-org/RIOT,BytesGalore/RIOT,biboc/RIOT,aeneby/RIOT,BytesGalore/RIOT,RIOT-OS/RIOT,miri64/RIOT,x3ro/RIOT,josephnoir/RIOT,OTAkeys/RIOT,rfuentess/RIOT,ant9000/RIOT,authmillenon/RIOT,x3ro/RIOT