staging: rtl8192e: Fix conflicting types error with net_device.

Add a pre-declaration of struct net_device so the compiler is able to
use rtl_pci.h / rtl_cam.h.

Signed-off-by: Teddy Engel <[email protected]>
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Fixes: 7dff0b2 ("staging: rtl8192e: Remove unnecessary pre-declaration of struct net_device")
Tested-by: Philipp Hortmann <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: TeddyEngel

drivers/staging/rtl8192e/rtl8192e/rtl_cam.h

@@ -12,6 +12,8 @@
 
 #include <linux/types.h>
 
+struct net_device;
+
 void rtl92e_cam_reset(struct net_device *dev);
 void rtl92e_enable_hw_security_config(struct net_device *dev);
 void rtl92e_set_key(struct net_device *dev, u8 EntryNo, u8 KeyIndex,

drivers/staging/rtl8192e/rtl8192e/rtl_pci.h

@@ -13,6 +13,8 @@
 #include <linux/types.h>
 #include <linux/pci.h>
 
+struct net_device;
+
 bool rtl92e_check_adapter(struct pci_dev *pdev, struct net_device *dev);
 
 #endif