drm/xe: Remove extra xe_mmio_read32 from xe_mmio_wait32

Commit 5a2be6ba6ba0 ("drm/xe: Let's return last value read on
xe_mmio_wait32.") mentions that we should return the last value read,
but we never actually return it. This breaks display which depends on
the value being actually returned where needed.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Fixes: 5a2be6ba6ba0 ("drm/xe: Let's return last value read on xe_mmio_wait32.")
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Closes: drm/xe/kernel#257

drivers/gpu/drm/xe/xe_mmio.h

@@ -85,9 +85,6 @@ static inline int xe_mmio_wait32(struct xe_gt *gt, u32 reg, u32 val, u32 mask,
 	u32 read;
 
 	for (;;) {
-		if ((xe_mmio_read32(gt, reg) & mask) == val)
-			return 0;
-
 		read = xe_mmio_read32(gt, reg);
 		if ((read & mask) == val) {
 			ret = 0;