hvmloader: fix build error `invalid digit "8" in octal constant'

hvmloader: fix build error `invalid digit "8" in octal constant'

commit b9245b75 introduces a building error:
make[1]: Entering directory `/root/work/xen/tools/firmware/hvmloader'
gcc   -O1 -fno-omit-frame-pointer -m32 -march=i686 -g -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes -Wdeclaration-after-statement   -O0 -g3 -D__XEN_TOOLS__ -MMD -MF .smbios.o.d -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -fno-optimize-sibling-calls -mno-tls-direct-seg-refs  -Werror -fno-stack-protector -fno-exceptions -fno-builtin -msoft-float -I/root/work/xen/tools/firmware/hvmloader/../../../tools/include -DENABLE_ROMBIOS -DENABLE_SEABIOS -D__SMBIOS_DATE__="04/08/2015"  -c -o smbios.o smbios.c
smbios.c:384:46: error: invalid digit "8" in octal constant
smbios.c:792:46: error: invalid digit "8" in octal constant
make[1]: *** [smbios.o] Error 1

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>