if_cxgbev build error on -stable

[Andrey Chernov]

On recent i386 -stable I got:

...
/usr/src/sys/modules/cxgbe/if_cxgbev/../../../dev/cxgbe/t4_vf.c -o t4_vf.o
In file included from
/usr/src/sys/modules/cxgbe/if_cxgbev/../../../dev/cxgbe/t4_vf.c:37:
In file included from @/sys/counter.h:35:
./machine/counter.h:170:3: error: implicit declaration of function
      'critical_enter' is invalid in C99
      [-Werror,-Wimplicit-function-declaration]
                critical_enter();
                ^
./machine/counter.h:172:3: error: implicit declaration of function
      'critical_exit' is invalid in C99
      [-Werror,-Wimplicit-function-declaration]
                critical_exit();
                ^
./machine/counter.h:172:3: note: did you mean 'critical_enter'?
./machine/counter.h:170:3: note: 'critical_enter' declared here
                critical_enter();
                ^
In file included from
/usr/src/sys/modules/cxgbe/if_cxgbev/../../../dev/cxgbe/t4_vf.c:47:
In file included from
/usr/src/sys/modules/cxgbe/if_cxgbev/../../../dev/cxgbe/common/common.h:33:
In file included from
/usr/src/sys/modules/cxgbe/if_cxgbev/../../../dev/cxgbe/common/t4_hw.h:33:
In file included from
/usr/src/sys/modules/cxgbe/if_cxgbev/../../../dev/cxgbe/osdep.h:39:
@/sys/systm.h:196:6: error: conflicting types for 'critical_enter'
void    critical_enter(void);
        ^
./machine/counter.h:170:3: note: previous implicit declaration is here
                critical_enter();
                ^
In file included from
/usr/src/sys/modules/cxgbe/if_cxgbev/../../../dev/cxgbe/t4_vf.c:47:
In file included from
/usr/src/sys/modules/cxgbe/if_cxgbev/../../../dev/cxgbe/common/common.h:33:
In file included from
/usr/src/sys/modules/cxgbe/if_cxgbev/../../../dev/cxgbe/common/t4_hw.h:33:
In file included from
/usr/src/sys/modules/cxgbe/if_cxgbev/../../../dev/cxgbe/osdep.h:39:
@/sys/systm.h:197:6: error: conflicting types for 'critical_exit'
void    critical_exit(void);
        ^
./machine/counter.h:172:3: note: previous implicit declaration is here
                critical_exit();
                ^
4 errors generated.
*** Error code 1

Stop.