Avoid divide by 0 exception

CLA: trivial

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from #19310)

include/internal/safe_math.h

@@ -183,7 +183,7 @@
                                                                type b,       \
                                                                int *err)     \
     {                                                                        \
-        if (a > max / b)                                                     \
+        if (b != 0 && a > max / b)                                           \
             *err |= 1;                                                       \
         return a * b;                                                        \
     }