openocd: manually fix Yoda conditions

Fix the remaining Yoda conditions, detected by checkpatch but not
fixed automatically.

While there, apply minor style changes.

Change-Id: I6e1978b89c4d56a20aceaeb2b52968eb6384432a
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/6356
Tested-by: jenkins
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>
Reviewed-by: Xiang W <wxjstz@126.com>

src/target/arm_semihosting.c

@@ -367,7 +367,7 @@ int arm_semihosting(struct target *target, int *retval)
 		}
 
 		/* Check for ARM operation numbers. */
-		if (0 <= semihosting->op && semihosting->op <= 0x31) {
+		if (semihosting->op >= 0 && semihosting->op <= 0x31) {
 			*retval = semihosting_common(target);
 			if (*retval != ERROR_OK) {
 				LOG_ERROR("Failed semihosting operation (0x%02X)", semihosting->op);