lib.sh and rom.sh: stricter mktemp usage

error out under fault condition

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/lib.sh

@@ -114,7 +114,8 @@ unpad_one_byte()
 
 fx_()
 {
-	fd="`mktemp`" && x_ rm -f "$fd" && x_ touch "$fd"
+	fd="`mktemp || err "can't create tmpfile"`" || err
+	x_ rm -f "$fd" && x_ touch "$fd"
 	xx="$1" && shift 1
 	"$@" 2>/dev/null | sort 1>"$fd" 2>/dev/null || err "FATAL: !sort fx_"
 	dx_ "$xx" "$fd" || :

include/rom.sh

@@ -257,7 +257,7 @@ cprom()
 	    newrom="${newrom%.rom}_${tmpnew%.gkb}.rom"
 
 	irom="$tmprom"
-	[ $# -lt 1 ] || irom="`mktemp`" || err "!mk irom, $(echo "$@")"
+	[ $# -lt 1 ] || irom="`mktemp || err "!mk irom, $(echo "$@")"`" || err
 	[ $# -gt 0 ] && x_ cp "$tmprom" "$irom" && cpcmd="mv"
 
 	[ $# -gt 0 ] && [ "${1%.gkb}" != "$1" ] && \