x86/microcode/intel: Fix BDW late-loading revision check

The backport of commit b94b7373 ("x86/microcode/intel: Extend BDW
late-loading with a revision check") to 4.4-stable deleted a "return true"
statement.  This bug is not present upstream or other stable branches.
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/x86/kernel/cpu/microcode/intel.c

@@ -1005,6 +1005,7 @@ static bool is_blacklisted(unsigned int cpu)
 	    c->microcode < 0x0b000021) {
 		pr_err_once("Erratum BDF90: late loading with revision < 0x0b000021 (0x%x) disabled.\n", c->microcode);
 		pr_err_once("Please consider either early loading through initrd/built-in or a potential BIOS update.\n");
+		return true;
 	}
 
 	return false;