isxdigit -> qemu_isxdigit

Hi!

Attached patch uses qemu_isxdigit() instead of isxdigit().
Fixes build warning on NetBSD.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

--
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen
Geschaeftsfuehrer: Thomas M. McCoy, Giuliano Meroni
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
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diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
index 06c25af..76699b0 100644
--- a/hw/qdev-properties.c
+++ b/hw/qdev-properties.c
@@ -117,9 +117,9 @@
     char *p;
 
     for (i = 0, pos = 0; i < 6; i++, pos += 3) {
-        if (!isxdigit(str[pos]))
+        if (!qemu_isxdigit(str[pos]))
             return -1;
-        if (!isxdigit(str[pos+1]))
+        if (!qemu_isxdigit(str[pos+1]))
             return -1;
         if (i == 5 && str[pos+2] != '\0')
             return -1;