i2ctransfer sends and receives user defined i2c messages
v2: apply Xabier's comments: add -a option, don't decrement argc,
use bb_show_usage() and xzalloc()
v3: fix possible out of bound access to msgs[nmsgs]
Reviewed-by: Xabier Oneca -- xOneca <xoneca@gmail.com>
Signed-off-by: Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>