[PATCH] Fix 2 possible SEGVs in tftp client

[KRONSTORFER Horst]

hi!

attached patch fixes 2 possible segfaults in tftp.c:

1) when both -l and -r are omitted, a null pointer is passed for 'remotefile'
to tftp() which doesn't expect a null pointer for this argument.

2) when hostname/ipaddr is omitted, a null pointer is passed for 'name'
to gethostbyname() (via xgethostbyname()) which doesn't expect a null
pointer for this argument.

-h





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