MFC r299704:

MFC r299704:
r299704 (by vangyzen):

iconvctl(3): remove superfluous NULL pointer tests

convname and dst are guaranteed to be non-NULL by iconv_open(3).
src is an array. Remove these tests for NULL pointers.
While I'm here, eliminate a strlcpy with a correct but suspicious-looking
calculation for the third parameter (i.e. not a simple sizeof).
Compare the strings in-place instead of copying.

Found by:	bdrewery
Found by:	Coverity
CID:		1130050, 1130056

git-svn-id: svn://svn.freebsd.org/base/stable/10@309482 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f