Allow upper-case 'X' for hexidecimal in parser

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/parse.c b/parse.c
index b40d51c..879a3aa 100644
--- a/parse.c
+++ b/parse.c
@@ -188,7 +188,7 @@
 {
 	if (!strlen(p))
 		return 1;
-	if (strstr(p, "0x")) {
+	if (strstr(p, "0x") || strstr(p, "0X")) {
 		if (sscanf(p, "%x", val) == 1)
 			return 0;
 	} else {