[tests] fix test that uses TMPDIR

test/expected/expected.am

@@ -258,6 +258,8 @@ EXPECTED_FILES = \
     $(srcdir)/%reldir%/test_config.sh_a0907769aba112d628e7ebe39c4ec252e5e0bc69.out \
     $(srcdir)/%reldir%/test_config.sh_b08f7523659d1c12f0e59920cd40d17d4a83b72f.err \
     $(srcdir)/%reldir%/test_config.sh_b08f7523659d1c12f0e59920cd40d17d4a83b72f.out \
+    $(srcdir)/%reldir%/test_config.sh_d3df763c453c81ed3126337c643f9d9a1978119e.err \
+    $(srcdir)/%reldir%/test_config.sh_d3df763c453c81ed3126337c643f9d9a1978119e.out \
     $(srcdir)/%reldir%/test_config.sh_d622658dc98327b1b2fd346802d24bc633e34ac7.err \
     $(srcdir)/%reldir%/test_config.sh_d622658dc98327b1b2fd346802d24bc633e34ac7.out \
     $(srcdir)/%reldir%/test_config.sh_d708b6fd32d83ce0ee00ca5383388308ba5a06e1.err \

test/expected/test_config.sh_d3df763c453c81ed3126337c643f9d9a1978119e.err

@@ -0,0 +1,6 @@
+✘ error: expecting an integer, found: abc
+ --> command-option:1
+ | :config /tuning/archive-manager/min-free-space abc
+ = help: :config option [value]
+         ══════════════════════════════════════════════════════════════════════
+           Read or write a configuration option

test/test_config.sh

@@ -21,7 +21,9 @@ run_cap_test ${lnav_test} -n \
     ${test_dir}/logfile_access_log.0
 
 # invalid min-free-space allowed?
-run_cap_test env TMPDIR=tmp ${lnav_test} -n \
+rm -rf config-tmp
+mkdir config-tmp
+run_cap_test env TMPDIR=config-tmp ${lnav_test} -n \
     -c ':config /tuning/archive-manager/min-free-space abc' \
     ${srcdir}/logfile_syslog.0