x86 setup: handle more than 8 CPU flag words

Checkin e38e05a85828dac23540cd007df5f20985388afc added a 9th CPU flag
word, but didn't adjust the boot code to match.  This patch adds the
necessary boot code support.

Note: due to a typo in an #if statement, it didn't trigger the #error
this was supposed to do.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/x86/boot/cpu.c b/arch/x86/boot/cpu.c
index 75298fe..6ec6bb6 100644
--- a/arch/x86/boot/cpu.c
+++ b/arch/x86/boot/cpu.c
@@ -59,17 +59,18 @@
 			u32 e = err_flags[i];
 
 			for (j = 0; j < 32; j++) {
-				int n = (i << 5)+j;
-				if (*msg_strs < n) {
+				if (msg_strs[0] < i ||
+				    (msg_strs[0] == i && msg_strs[1] < j)) {
 					/* Skip to the next string */
-					do {
-						msg_strs++;
-					} while (*msg_strs);
-					msg_strs++;
+					msg_strs += 2;
+					while (*msg_strs++)
+						;
 				}
 				if (e & 1) {
-					if (*msg_strs == n && msg_strs[1])
-						printf("%s ", msg_strs+1);
+					if (msg_strs[0] == i &&
+					    msg_strs[1] == j &&
+					    msg_strs[2])
+						printf("%s ", msg_strs+2);
 					else
 						printf("%d:%d ", i, j);
 				}