with CONFIG_THERMAL=m and cxgb4 as built-in build fails, and
'commit 
e70a57fa59bb ("cxgb4: fix thermal configuration dependencies")'
tries to fix it but when cxgb4i is made built-in build fails again,
use IS_REACHABLE instead of IS_ENABLED to fix the issue.
Fixes: e70a57fa59bb (cxgb4: fix thermal configuration dependencies)
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 
 config CHELSIO_T4
        tristate "Chelsio Communications T4/T5/T6 Ethernet support"
        depends on PCI && (IPV6 || IPV6=n)
-       depends on THERMAL || !THERMAL
        select FW_LOADER
        select MDIO
        select ZLIB_DEFLATE
 
 cxgb4-$(CONFIG_CHELSIO_T4_DCB) +=  cxgb4_dcb.o
 cxgb4-$(CONFIG_CHELSIO_T4_FCOE) +=  cxgb4_fcoe.o
 cxgb4-$(CONFIG_DEBUG_FS) += cxgb4_debugfs.o
-ifdef CONFIG_THERMAL
-cxgb4-objs += cxgb4_thermal.o
-endif
+cxgb4-$(CONFIG_THERMAL) += cxgb4_thermal.o
 
        if (!is_t4(adapter->params.chip))
                cxgb4_ptp_init(adapter);
 
-       if (IS_ENABLED(CONFIG_THERMAL) &&
+       if (IS_REACHABLE(CONFIG_THERMAL) &&
            !is_t4(adapter->params.chip) && (adapter->flags & FW_OK))
                cxgb4_thermal_init(adapter);
 
 
                if (!is_t4(adapter->params.chip))
                        cxgb4_ptp_stop(adapter);
-               if (IS_ENABLED(CONFIG_THERMAL))
+               if (IS_REACHABLE(CONFIG_THERMAL))
                        cxgb4_thermal_remove(adapter);
 
                /* If we allocated filters, free up state associated with any