northbridge/intel/nehalem/raminit.c: Extraneous parenthese

Equality comparison with extraneous parenthese, spotted by Clang.

Change-Id: I8d532392a0365753583ed441958e06d5da784587
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/6124
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/northbridge/intel/nehalem/raminit.c

@@ -4148,7 +4148,7 @@ void raminit(const int s3resume, const u8 *spd_addrmap)
 	write_mchbar32(0x1af0, 0x1f020003);
 	gav(read_mchbar32(0x1af0));	// !!!!
 
-	if (((x2ca8 == 0))) {
+	if (x2ca8 == 0) {
 		write_mchbar8(0x2ca8, read_mchbar8(0x2ca8) | 1);	// guess
 	}