chelsio: sparse warning fixes (old cxgb2)

Fix problems detected by sparse:
1. whole chunk of MAC code was for defined and never used
2. hook for running ext intr in workqueue wasn't being used

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/chelsio/Makefile

@@ -4,6 +4,6 @@
 
 obj-$(CONFIG_CHELSIO_T1) += cxgb.o
 
-cxgb-$(CONFIG_CHELSIO_T1_1G) += mac.o mv88e1xxx.o vsc7326.o
+cxgb-$(CONFIG_CHELSIO_T1_1G) += mv88e1xxx.o vsc7326.o
 cxgb-objs := cxgb2.o espi.o tp.o pm3393.o sge.o subr.o \
 	     mv88x201x.o my3126.o $(cxgb-y)

drivers/net/chelsio/common.h

@@ -372,6 +372,7 @@ extern void t1_interrupts_enable(adapter_t *adapter);
 extern void t1_interrupts_disable(adapter_t *adapter);
 extern void t1_interrupts_clear(adapter_t *adapter);
 extern int t1_elmer0_ext_intr_handler(adapter_t *adapter);
+extern void t1_elmer0_ext_intr(adapter_t *adapter);
 extern int t1_slow_intr_handler(adapter_t *adapter);
 
 extern int t1_link_start(struct cphy *phy, struct cmac *mac, struct link_config *lc);

drivers/net/chelsio/subr.c

@@ -884,7 +884,7 @@ static int asic_slow_intr(adapter_t *adapter)
 	if (cause & F_PL_INTR_PCIX)
 		t1_pci_intr_handler(adapter);
 	if (cause & F_PL_INTR_EXT)
-		t1_elmer0_ext_intr_handler(adapter);
+		t1_elmer0_ext_intr(adapter);
 
 	/* Clear the interrupts just processed. */
 	writel(cause, adapter->regs + A_PL_CAUSE);