igc: Fix static checker warning

drivers/net/ethernet/intel/igc/igc_mac.c:424 igc_check_for_copper_link()
error: uninitialized symbol 'link'.
This patch come to fix this warning and initialize the 'link' symbol.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 707abf06 ("igc: Add initial LTR support")
Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/igc/igc_mac.c

@@ -355,8 +355,8 @@ void igc_rar_set(struct igc_hw *hw, u8 *addr, u32 index)
 s32 igc_check_for_copper_link(struct igc_hw *hw)
 {
 	struct igc_mac_info *mac = &hw->mac;
+	bool link = false;
 	s32 ret_val;
-	bool link;
 
 	/* We only want to go out to the PHY registers to see if Auto-Neg
 	 * has completed and/or if our link status has changed.  The