intelfb: Fix bug in DPLL disable

Reported in Kernel Bugzilla 9006

Fix an obvious bug in DPLL disable.

---

 drivers/video/intelfb/intelfbhw.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index 16bc8d7..c6d1c7b 100644
@@ -1352,7 +1352,7 @@ #endif
 
 	/* turn off PLL */
 	tmp = INREG(dpll_reg);
-	dpll_reg &= ~DPLL_VCO_ENABLE;
+	tmp &= ~DPLL_VCO_ENABLE;
 	OUTREG(dpll_reg, tmp);
 
 	/* Set PLL parameters */

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