[syslinux:firmware] isolinux: use parenthesis to clarify operator precedence

[syslinux-bot for Matt Fleming]

Commit-ID:  4a369d496b25cb4098fff8d5caa48a9283a0d4a6
Gitweb:     http://www.syslinux.org/commit/4a369d496b25cb4098fff8d5caa48a9283a0d4a6
Author:     Matt Fleming <matt.fleming at intel.com>
AuthorDate: Wed, 19 Jun 2013 16:21:33 +0100
Committer:  Matt Fleming <matt.fleming at intel.com>
CommitDate: Wed, 19 Jun 2013 16:21:33 +0100

isolinux: use parenthesis to clarify operator precedence

and fix the following compiler warning,

core/isolinux-c.c: In function ‘get_derivative_info’:
core/isolinux-c.c:17:2: warning: suggest parentheses around ‘-’ inside ‘>>’ [-Wparentheses]

Signed-off-by: Matt Fleming <matt.fleming at intel.com>

---
 core/isolinux-c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/isolinux-c.c b/core/isolinux-c.c
index b987b68..6c9a8f2 100644
--- a/core/isolinux-c.c
+++ b/core/isolinux-c.c
@@ -14,7 +14,7 @@ __export void get_derivative_info(union syslinux_derivative_info *di)
 	di->iso.filesystem = SYSLINUX_FS_ISOLINUX;
 	di->iso.sector_shift = SectorShift;
 	di->iso.drive_number = DriveNumber;
-	di->iso.cd_mode = (BIOSType - bios_cdrom >> 2);
+	di->iso.cd_mode = ((BIOSType - bios_cdrom) >> 2);
 
 	di->iso.spec_packet = spec_packet;
 	di->iso.esdi_ptr = GET_PTR(OrigESDI);