[PATCH] * random/random-drbg.c (drbg_hmac_update): Don't memset if, length is zero

[Kristian Fiskerstrand]

[resending as previous message was sent using a non-subscribed addresse,
please excuse any duplicate]

* random/random-drbg.c (drbg_hmac_update): Don't memset if length is zero

--
A zero length memset triggers __warn_memset_zero_len() in glibc, so
only invoking memset if non-zero value

A user reported an issue in
https://bugs.gentoo.org/show_bug.cgi?id=606740

/usr/include/bits/string3.h:86:7: warning: call to
'__warn_memset_zero_len' declared with attribute warning: memset used
with constant zero length parameter; this could be due to transposed
parameters
       __warn_memset_zero_len ();

which subsequently resulted in linking error for
./.libs/libgcrypt.so: undefined reference to `__warn_memset_zero_len'

-- 
----------------------------
Kristian Fiskerstrand
Blog: https://blog.sumptuouscapital.com
Twitter: @krifisk
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