[PATCH] video: fbdev: sis: use explicitly signed char

["Jason A. Donenfeld" <Jason@zx2c4.com>]

With char becoming unsigned by default, and with `char` alone being
ambiguous and based on architecture, signed chars need to be marked
explicitly as such. This fixes warnings like:

drivers/video/fbdev/sis/init301.c:3549 SiS_GetCRT2Data301() warn: 'SiS_Pr->SiS_EModeIDTable[ModeIdIndex]->ROMMODEIDX661' is unsigned

Cc: Thomas Winischhofer <thomas@winischhofer.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-usb@vger.kernel.org
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 drivers/usb/misc/sisusbvga/sisusb_struct.h | 2 +-
 drivers/video/fbdev/sis/vstruct.h          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/misc/sisusbvga/sisusb_struct.h b/drivers/usb/misc/sisusbvga/sisusb_struct.h
index 3df64d2a9d43..a86032a26d36 100644
--- a/drivers/usb/misc/sisusbvga/sisusb_struct.h
+++ b/drivers/usb/misc/sisusbvga/sisusb_struct.h
@@ -91,7 +91,7 @@ struct SiS_Ext {
 	unsigned char VB_ExtTVYFilterIndex;
 	unsigned char VB_ExtTVYFilterIndexROM661;
 	unsigned char REFindex;
-	char ROMMODEIDX661;
+	signed char ROMMODEIDX661;
 };
 
 struct SiS_Ext2 {
diff --git a/drivers/video/fbdev/sis/vstruct.h b/drivers/video/fbdev/sis/vstruct.h
index ea94d214dcff..d7a14e63ba5a 100644
--- a/drivers/video/fbdev/sis/vstruct.h
+++ b/drivers/video/fbdev/sis/vstruct.h
@@ -148,7 +148,7 @@ struct SiS_Ext {
 	unsigned char  VB_ExtTVYFilterIndex;
 	unsigned char  VB_ExtTVYFilterIndexROM661;
 	unsigned char  REFindex;
-	char           ROMMODEIDX661;
+	signed char    ROMMODEIDX661;
 };
 
 struct SiS_Ext2 {
-- 
2.38.1