sstate: Ensure mkdir happens before mktemp

This avoids a directory not present error.

Fix a comment typo whilst here.

(From OE-Core rev: 1360d8d7d99b70a80c8cdbc1fc6d9e6752483139)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/sstate.bbclass

@@ -747,14 +747,13 @@ sstate_task_postfunc[dirs] = "${WORKDIR}"
 # set as SSTATE_BUILDDIR. Will be run from within SSTATE_BUILDDIR.
 #
 sstate_create_package () {
-	TFILE=`mktemp ${SSTATE_PKG}.XXXXXXXX`
-
-	# Exit earlu if it already exists
+	# Exit early if it already exists
 	if [ -e ${SSTATE_PKG} ]; then
 		return
 	fi
 
         mkdir -p `dirname ${SSTATE_PKG}`
+	TFILE=`mktemp ${SSTATE_PKG}.XXXXXXXX`
 
         # Use pigz if available
         OPT="-czS"