avr32_regs: add missing error propagation

Change-Id: Ie8b141dd534d73eccfc045069d5f628bd1eea88e
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/166
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

src/target/avr32_regs.c

@@ -97,6 +97,9 @@ int avr32_jtag_write_regs(struct avr32_jtag *jtag_info, uint32_t *regs)
 	int i, retval;
 
 	retval = avr32_jtag_write_reg(jtag_info, 0, regs[AVR32_REG_SR]);
+	if (retval != ERROR_OK)
+		return retval;
+
 	/* Restore Status reg */
 	retval = avr32_jtag_exec(jtag_info, MTSR(0, 0));
 	if (retval != ERROR_OK)