Fix warning about negative unsigned intergers

Reviewed-by: Richard Levitte <levitte@openssl.org>
Fix free of garbage pointer. PR#3595

Reviewed-by: Emilia Käsper <emilia@openssl.org>
(cherry picked from commit e04d426bf98ebb22abf0f15b6f09d333a6e8b2ad)
Correct timestamp output when clock_precision_digits > 0

PR#3535

Reviewed-by: Stephen Henson <steve@openssl.org>
Fixes a minor typo in the EVP docs.

Out is the buffer which needs to contain at least inl + cipher_block_size - 1 bytes. Outl
is just an int*.

Reviewed-by: Emilia Käsper <emilia@openssl.org>
(cherry picked from commit 5211e094dec9486a540ac480f345df1a8d2b2862)
Merge 'OpenSSL_1_0_2-stable' into 1.0.2-chacha