target/arm_tpiu: Fix 'tpiu create' parameter check

target/arm_tpiu: Fix 'tpiu create' parameter check

The current implementation crashes when executing 'tpiu create'
without an object name due to an invalid memory access. Pass 'argv'
instead 'goi.argv' to fix the problem.

While at it, match the style of the error message to the style used for
other Tcl commands. Especially, make the 'name' parameter mandatory.

Change-Id: Ib2b233f8556934af61608ae93d6405585c2c40b7
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/6329
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins