Avoid buffer underflow in evp_test.
The second loop in the remove_space function doesn't check for walking back off of the start of the string while setting white space to 0. This fix exits this loop once the pointer is before the (updated) beginning of the string. Reviewed-by: NRichard Levitte <levitte@openssl.org> Reviewed-by: NRich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2752)
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