x86, early_serial_console: Remove unnecessary check

We do this check already a couple of lines up.
Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
Link: http://lkml.kernel.org/r/1420009958-4803-1-git-send-email-kuleshovmail@gmail.comSigned-off-by: Borislav Petkov <bp@suse.de>

arch/x86/boot/early_serial_console.c

@@ -72,7 +72,7 @@ static void parse_earlyprintk(void)
 			static const int bases[] = { 0x3f8, 0x2f8 };
 			int idx = 0;
 
-			if (!strncmp(arg + pos, "ttyS", 4))
+			/* += strlen("ttyS"); */
 			pos += 4;
 
 			if (arg[pos++] == '1')