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a pointer to an error code and can be any of the following:
OS_ERR_NONE
if If the timer was deleted.
OS_ERR_OBJ_TYPE
if If OS_CFG_OBJ_TYPE_CHK_EN is set to 1 in os_cfg.h: if the user did not pass a pointer to a timer.
OS_ERR_TMR_INVALID
if If OS_CFG_ARG_CHK_EN is set to 1 in os_cfg.h: if p_tmr is a NULL pointer.
OS_ERR_TMR_ISR
if If OS_CFG_CALLED_FROM_ISR_CHK_EN set to 1 in os_cfg.h: This function is called from an ISR, which is not allowed.
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