km/ivm: fix string len check to support 7 char board names

The fanless boards now have a 7-digit (XXXXX-F) board name. This
triggers a border condition when reading this string in the IVM although
this string is smaller than the currenly read string size, but only by 1
character.

This patch corrects this by changing the size check condition for string
length. It is the same change that was done in the platform for this
same bug.
Signed-off-by: NValentin Longchamp <valentin.longchamp@keymile.com>
cc: Holger Brunck <holger.brunck@keymile.com>
cc: Stefan Bigler <stefan.bigler@keymile.com>

board/keymile/common/ivm.c

@@ -163,7 +163,7 @@ static int ivm_findinventorystring(int type,
 		if (addr == INVENTORYDATASIZE) {
 			xcode = -1;
 			printf("Error end of string not found\n");
-		} else if ((size >= (maxlen - 1)) &&
+		} else if ((size > (maxlen - 1)) &&
 			   (buf[addr] != '\r')) {
 			xcode = -1;
 			printf("string too long till next CR\n");