MSP430: Fix unused arg warning

MSP430: Fix unused arg warning

The build robot found this:

g++ -c   -g -O2 -DIN_GCC  -DCROSS_DIRECTORY_STRUCTURE  -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common  -DHAVE_CONFIG_H -I. -I. -I../../../gcc/gcc -I../../../gcc/gcc/. -I../../../gcc/gcc/../include -I../../../gcc/gcc/../libcpp/include -I/opt/cfarm/mpc/include  -I../../../gcc/gcc/../libdecnumber -I../../../gcc/gcc/../libdecnumber/dpd -I../libdecnumber -I../../../gcc/gcc/../libbacktrace   -o msp430.o -MT msp430.o -MMD -MP -MF ./.deps/msp430.TPo ../../../gcc/gcc/config/msp430/msp430.c
../../../gcc/gcc/config/msp430/msp430.c:979:43: error: unused parameter ‘file’ [-Werror=unused-parameter]
 msp430_asm_output_addr_const_extra (FILE *file, rtx x)
                                           ^
cc1plus: all warnings being treated as errors
make[2]: *** [msp430.o] Error 1

(See for example this build:
http://toolchain.lug-owl.de/buildbot/show_build_details.php?id=384666)

Ok for this one?

2014-12-17  Jan-Benedict Glaw  <jbglaw@lug-owl.de>

        * config/msp430/msp430.c (msp430_asm_output_addr_const_extra): Fix
        unused argument warning.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218828 138bc75d-0d04-0410-961f-82ee72b054a4