USB: EHCI: Rearrange create_companion_file() to avoid GCC-4.6 warnings.

In create_companion_file() there is a bogus assignemt to i created for
the express purpose of avoiding an ignored return value warning.

With pre-release GCC-4.6, this causes a 'set but not used' warning.

Kick the problem further down the road by just returning i.  All the
callers of create_companion_file() ignore its return value, so all is
good:

o No warnings are issued.

o We still subvert the desires of the authors of device_create_file()
  by ignorning error conditions.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/ehci-hub.c

@@ -531,14 +531,15 @@ static ssize_t store_companion(struct device *dev,
 }
 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
 
-static inline void create_companion_file(struct ehci_hcd *ehci)
+static inline int create_companion_file(struct ehci_hcd *ehci)
 {
-	int	i;
+	int	i = 0;
 
 	/* with integrated TT there is no companion! */
 	if (!ehci_is_TDI(ehci))
 		i = device_create_file(ehci_to_hcd(ehci)->self.controller,
 				       &dev_attr_companion);
+	return i;
 }
 
 static inline void remove_companion_file(struct ehci_hcd *ehci)