epm-sh-functions: fix BIGTMPDIR

bin/epm-sh-functions

@@ -834,7 +834,7 @@ set_bigtmpdir()
     # https://bugzilla.mozilla.org/show_bug.cgi?id=69938
     # https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch05s15.html
     # https://geekpeach.net/ru/%D0%BA%D0%B0%D0%BA-systemd-tmpfiles-%D0%BE%D1%87%D0%B8%D1%89%D0%B0%D0%B5%D1%82-tmp-%D0%B8%D0%BB%D0%B8-var-tmp-%D0%B7%D0%B0%D0%BC%D0%B5%D0%BD%D0%B0-tmpwatch-%D0%B2-centos-rhel-7
-    [ -n "$BIGTMPDIR" ] || [ -d "/var/tmp" ] && BIGTMPDIR="/var/tmp" || BIGTMPDIR="$TMPDIR"
+    [ -z "$BIGTMPDIR" ] && [ -d "/var/tmp" ] && BIGTMPDIR="/var/tmp" || BIGTMPDIR="$TMPDIR"
     export BIGTMPDIR
 }