get_variant_name: remove redundant temp dir

No longer useful for any purpose.

Signed-off-by: Luca Burelli <l.burelli@arduino.cc>

Author: pillo79

extra/get_variant_name.sh

@@ -4,8 +4,5 @@ set -e
 source venv/bin/activate
 
 # Get the variant name (NORMALIZED_BOARD_TARGET in Zephyr)
-tmpdir=$(mktemp -d)
 variant=$(cmake "-DBOARD=$1" -P extra/get_variant_name.cmake 2>/dev/null | grep 'VARIANT=' | cut -d '=' -f 2)
-rm -rf ${tmpdir}
-
 echo $variant