nb/intel/i945/raminit.c: Set "integrated_graphics" as bool

"integrated_graphics" is already used as a "bool" at line #2128.
So set it as "bool".

Change-Id: Ic5286e691c312e8e44bbbd8e782fdfd4a13cb60f
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60056
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
diff --git a/src/northbridge/intel/i945/raminit.c b/src/northbridge/intel/i945/raminit.c
index 03419ca..566d3e7 100644
--- a/src/northbridge/intel/i945/raminit.c
+++ b/src/northbridge/intel/i945/raminit.c
@@ -2121,7 +2121,7 @@
 {
 	u16 reg16;
 	u32 reg32;
-	int integrated_graphics = 1;
+	bool integrated_graphics = true;
 	int i;
 
 	if (!(pci_read_config8(HOST_BRIDGE, DEVEN) & (DEVEN_D2F0 | DEVEN_D2F1)))