Zach Welch <zw@superlucidity.net> fix -Werror warnings

src/helper/binarybuffer.c

src/jtag/jtag.c

src/jtag/rlink/rlink.c

src/pld/virtex2.c

src/pld/xilinx_bit.c

src/server/gdb_server.c

src/svf/svf.c

src/target/arm720t.h

src/target/arm7_9_common.c

src/target/arm7_9_common.h

src/target/arm920t.h

src/target/arm926ejs.h

src/target/arm_jtag.h

src/target/armv4_5.c

src/target/armv7m.c

src/target/cortex_m3.c

src/target/embeddedice.c

src/target/etb.c

src/target/etb.h

src/target/etm.c