staging: xgifb: Initialize uninitialized variables

Current patch solves compilation warnings in staging/xgifb for using
possibly uninitialized variables.
Signed-off-by: NJavier 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;
+	unsigned short ModeIdIndex = 0;
 	/* unsigned char *pVBInfo->FBAddr = HwDeviceExtension->pjVideoMemoryAddress; */
 	struct vb_device_info VBINF;
 	struct vb_device_info *pVBInfo = &VBINF;
@@ -3834,7 +3834,7 @@ unsigned char XGI_SetCRT2Group301(unsigned short ModeNo,
 		struct xgi_hw_device_info *HwDeviceExtension,
 		struct vb_device_info *pVBInfo)
 {
-	unsigned short tempbx, ModeIdIndex, RefreshRateTableIndex;
+	unsigned short tempbx, ModeIdIndex = 0, RefreshRateTableIndex;
 
 	tempbx = pVBInfo->VBInfo;
 	pVBInfo->SetFlag |= ProgrammingCRT2;