Undo changes that make -R branch logic behave the same as non -R branch,

that is, to close(0) and open /dev/null as fd=0 instead of fd=3.

(Partially) Revert "Ensure fd 0 stdin </dev/null is always inheritable."

This partially reverts commit 7946678f271e25473618929d6f2725c8c375563e.

gunicorn/util.py

@@ -497,17 +497,13 @@ def daemonize(enable_stdio_inheritance=False):
             os.dup2(fd_null, 2)
 
         else:
+            fd_null = os.open(REDIRECT_TO, os.O_RDWR)
+
             # Always redirect stdin to /dev/null as we would
             # never expect to need to read interactive input.
 
-            os.close(0)
-
-            fd_null = os.open(REDIRECT_TO, os.O_RDWR)
-            # PEP 446, make fd for /dev/null inheritable
-            os.set_inheritable(fd_null, True)
-
-            # expect fd_null to be always 0 here, but in-case not ...
             if fd_null != 0:
+                os.close(0)
                 os.dup2(fd_null, 0)
 
             # If stdout and stderr are still connected to