42f7c6ed63
Make if_printf() use vlog() instead of vprintf(). This means it can no longer return the number of characters printed, as it used to, but every single call to if_printf() in the entire kernel ignores the return value anyway; just return 0 so we don't have to change the prototype. Consistently use if_printf() throughout sys/net/if.c, instead of a mixture of if_printf() and log(). In ifa_maintain_loopback_route(), don't needlessly log an error if we either failed to add a route because it already existed or failed to remove one because it did not. We still return an error code, though. MFC after: 1 week
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