Fixed memory leak in os/timer.c, introduced in r6796.
Merge from trunk.
Updated debug Makedefs to avoid duplicating the linker arguments.
Added definition of __Vendor_SysTickConfig for TM4C CPUs.
Merge from trunk.
Enum values have inserted a space between the numeric sign and the number
TM4C: Fixed I2C read routine to acknowledge the first byte when doing a multi-byte read.
TM4C: Updated I2C driver to emit error codes in msg_ridx if a slave fails to acknowledge a transfer.