Peter Züger 95ee29f4f4 stm32/mbedtls: Add NULL pointer check in m_free_mbedtls.
According to the C standard the free(void *ptr) function: if ptr is a null
pointer, no action occurs.

Signed-off-by: Peter Züger <zueger.peter@icloud.com>
2022-03-17 13:11:22 +11:00
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