apps/speed.c: Wait for generated children
In multi-mode, speed fork()s off several children but does not wait for them.
On Linux, this leads to wrong accounting information of getrusage used by
tools to extract running time and page faults.
Wait for every children and check the return code and termination signal.
Signed-off-by: Juergen Christ <jchrist@linux.ibm.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19093)
(cherry picked from commit
56233ba8574c01b3912cf662335fedaabc7faec2)