target: Use ERR_CAST inlined function

Use ERR_CAST inlined function instead of ERR_PTR(PTR_ERR(...))

The semantic patch that makes this output is available
in scripts/coccinelle/api/err_cast.cocci.

More information about semantic patching is available at
http://coccinelle.lip6.fr/



Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>