Staging: xgifb: revert a warning fix and resolve it properly

Jiri pointed out that the previous compiler warning fix was incorrect as
the compiler was properly saying that the variable was not being set.
This was due to a #define commenting out all of the logic in the
function.

This patch reverts Javier's previous one, and properly fixes the issue
by making the function actually doing something.
Reported-by: NJiri Slaby <jirislaby@gmail.com>
Cc: Javier Martinez Canillas <martinez.javier@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/xgifb/vb_setmode.c

@@ -376,7 +376,7 @@ void InitTo330Pointer(unsigned char ChipType, struct vb_device_info *pVBInfo)
 unsigned char XGISetModeNew(struct xgi_hw_device_info *HwDeviceExtension,
 			unsigned short ModeNo)
 {
-	unsigned short ModeIdIndex = 0;
+	unsigned short ModeIdIndex;
 	/* unsigned char *pVBInfo->FBAddr = HwDeviceExtension->pjVideoMemoryAddress; */
 	struct vb_device_info VBINF;
 	struct vb_device_info *pVBInfo = &VBINF;
@@ -3512,9 +3512,6 @@ unsigned char XGI_GetLCDInfo(unsigned short ModeNo, unsigned short ModeIdIndex,
 unsigned char XGI_SearchModeID(unsigned short ModeNo,
 		unsigned short *ModeIdIndex, struct vb_device_info *pVBInfo)
 {
-
-#ifdef LINUX /* chiawen for linux solution */
-
 	if (ModeNo <= 5)
 		ModeNo |= 1;
 	if (ModeNo <= 0x13) {
@@ -3541,8 +3538,6 @@ unsigned char XGI_SearchModeID(unsigned short ModeNo,
 		}
 	}
 
-#endif
-
 	return 1;
 }
 
@@ -3834,7 +3829,7 @@ unsigned char XGI_SetCRT2Group301(unsigned short ModeNo,
 		struct xgi_hw_device_info *HwDeviceExtension,
 		struct vb_device_info *pVBInfo)
 {
-	unsigned short tempbx, ModeIdIndex = 0, RefreshRateTableIndex;
+	unsigned short tempbx, ModeIdIndex, RefreshRateTableIndex;
 
 	tempbx = pVBInfo->VBInfo;
 	pVBInfo->SetFlag |= ProgrammingCRT2;