snmp trap usage

[Martijn van Duren]

I missed an argc check which causes snmp trap to segfault if called with
too few arguments instead of showing usage.

OK?

martijn@

Index: snmpc.c
===================================================================
RCS file: /cvs/src/usr.bin/snmp/snmpc.c,v
retrieving revision 1.30
diff -u -p -r1.30 snmpc.c
--- snmpc.c     14 Sep 2020 15:12:27 -0000      1.30
+++ snmpc.c     30 Nov 2020 16:25:24 -0000
@@ -788,6 +788,9 @@ snmpc_trap(int argc, char *argv[])
        if (version == SNMP_V1)
                errx(1, "trap is not supported for snmp v1");
 
+       if (argc < 3)
+               usage();
+
        if ((agent = snmpc_connect(argv[0], "162")) == NULL)
                err(1, "%s", snmp_app->name);