run-tests.py: skipped tests shouldn't change working directory

tests/run-tests.py

@@ -522,18 +522,11 b' def runone(options, test, skips, fails):'
         hgrc.write('appendpid=True\n')
     hgrc.close()
 
-    err = os.path.join(TESTDIR, test+".err")
+    testpath = os.path.join(TESTDIR, test)
     ref = os.path.join(TESTDIR, test+".out")
-    testpath = os.path.join(TESTDIR, test)
-
+    err = os.path.join(TESTDIR, test+".err")
     if os.path.exists(err):
         os.remove(err)       # Remove any previous output files
-
-    # Make a tmp subdirectory to work in
-    tmpd = os.path.join(HGTMP, test)
-    os.mkdir(tmpd)
-    os.chdir(tmpd)
-
     try:
         tf = open(testpath)
         firstline = tf.readline().rstrip()
@@ -563,6 +556,11 b' def runone(options, test, skips, fails):'
             return skip("not executable")
         cmd = '"%s"' % testpath
 
+    # Make a tmp subdirectory to work in
+    tmpd = os.path.join(HGTMP, test)
+    os.mkdir(tmpd)
+    os.chdir(tmpd)
+
     if options.timeout > 0:
         signal.alarm(options.timeout)