Fix a compiler warning: unused GetDevURandom()
``` random.cpp:255:13: error: unused function 'GetDevURandom' [-Werror,-Wunused-function] ``` Clang 9.0.0, FreeBSD 12.1 Silence by planting a dummy reference to the `GetDevURandom` symbol in the places where we don't call the function.
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@ -314,12 +314,16 @@ void GetOSRand(unsigned char *ent32)
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if (getentropy(ent32, NUM_OS_RANDOM_BYTES) != 0) {
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RandFailure();
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}
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// Silence a compiler warning about unused function.
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(void)GetDevURandom;
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#elif defined(HAVE_GETENTROPY_RAND) && defined(MAC_OSX)
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/* getentropy() is available on macOS 10.12 and later.
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*/
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if (getentropy(ent32, NUM_OS_RANDOM_BYTES) != 0) {
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RandFailure();
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}
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// Silence a compiler warning about unused function.
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(void)GetDevURandom;
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#elif defined(HAVE_SYSCTL_ARND)
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/* FreeBSD, NetBSD and similar. It is possible for the call to return less
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* bytes than requested, so need to read in a loop.
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@ -333,6 +337,8 @@ void GetOSRand(unsigned char *ent32)
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}
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have += len;
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} while (have < NUM_OS_RANDOM_BYTES);
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// Silence a compiler warning about unused function.
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(void)GetDevURandom;
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#else
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/* Fall back to /dev/urandom if there is no specific method implemented to
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* get system entropy for this OS.
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