qlogic: qlcnic: fix use of SPEED_UNKNOWN ethtool constant

qlcnic driver uses u16 to store SPEED_UKNOWN ethtool constant,
which is defined as -1, resulting in value truncation and
thus incorrect test results against SPEED_UNKNOWN.

For example, the following test will print "False":

    u16 speed = SPEED_UNKNOWN;

    if (speed == SPEED_UNKNOWN)
        printf("True");
    else
        printf("False");

Change storage of speed to use u32 to avoid this issue.
Signed-off-by: Michael Zhivich <mzhivich@akamai.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qlcnic/qlcnic.h

@@ -497,7 +497,7 @@ struct qlcnic_hardware_context {
 	u16 board_type;
 	u16 supported_type;
 
-	u16 link_speed;
+	u32 link_speed;
 	u16 link_duplex;
 	u16 link_autoneg;
 	u16 module_type;