platform: no need to initialize nla sockaddr parameter to nl_recv()

We always call nl_recv() in a loop. If it would be necessary to clear
the variable, then it would need to happen inside the loop. But it's
not necessary.

src/libnm-platform/nm-linux-platform.c

@@ -9040,7 +9040,7 @@ event_handler_recvmsgs(NMPlatform *platform, gboolean handle_events)
     gboolean                interrupted = FALSE;
     struct nlmsghdr        *hdr;
     WaitForNlResponseResult seq_result;
-    struct sockaddr_nl      nla = {0};
+    struct sockaddr_nl      nla;
     struct ucred            creds;
     gboolean                creds_has;
     unsigned char          *buf;

src/libnm-platform/nm-netlink.c

@@ -1171,7 +1171,7 @@ nl_recvmsgs(struct nl_sock *sk, const struct nl_cb *cb)
     int                    n, nmerr = 0, multipart = 0, interrupted = 0, nrecv = 0;
     gs_free unsigned char *buf = NULL;
     struct nlmsghdr       *hdr;
-    struct sockaddr_nl     nla = {0};
+    struct sockaddr_nl     nla;
     struct ucred           creds;
     gboolean               creds_has;