checkapk: exit on trap signal

otherwise it cleans up but the loop keeps going and just fails until end,
just spamming the output

checkapk.in

@@ -47,7 +47,7 @@ fi
 
 startdir="$PWD"
 tmpdir=$(mktemp -d -t checkpkg-script.XXXXXX)
-trap "rm -rf '$tmpdir'" INT EXIT
+trap "rm -rf '$tmpdir'; exit" INT EXIT
 cd "$tmpdir" || die "failed to create temp dir"
 
 # storage for downloaded/copied apks