socket-util: drop _pure_ from a function with an output parameter

If it writes to memory, it's not pure, by definition.
Fixup for 882ac6e769c5c.

diff --git a/src/basic/socket-util.h b/src/basic/socket-util.h
index 0df1a600af512bfa4b0b301e968afdd072a05254..3c42e220e58df4d83121f77db6a8570fc8bf6142 100644 (file)
--- a/src/basic/socket-util.h
+++ b/src/basic/socket-util.h
@@ -102,7 +102,7 @@ const char* socket_address_get_path(const SocketAddress *a);
 
 bool socket_ipv6_is_supported(void);
 
-int sockaddr_port(const struct sockaddr *_sa, unsigned *port) _pure_;
+int sockaddr_port(const struct sockaddr *_sa, unsigned *port);
 
 int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, bool include_port, char **ret);
 int getpeername_pretty(int fd, bool include_port, char **ret);