nb/i945: Fix typo

Change-Id: I082ac2c1c13cbe6835a02d703f8651e837a43f37
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37518
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/northbridge/intel/i945/memmap.c

@@ -55,7 +55,7 @@ static uintptr_t northbridge_get_tseg_base(void)
 	else
 		tom = (pci_read_config8(PCI_DEV(0, 0, 0), TOLUD) & 0xf7) << 24;
 
-	/* subsctract TSEG size */
+	/* subtract TSEG size */
 	tom -= decode_tseg_size(pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC));
 	return tom;
 }