smp_mb(), smp_rmp() and smp_wmb() definitions have a trailing semicolon 
and cause compilation errors in single statement context, like 
if-then-else on line 358 in include/linux/skbuff.h. This patch removes 
all three offending semicolons to make it compile.
Signed-off-by: Meelis Roos <mroos@linux.ee>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: David S. Miller <davem@davemloft.net>