libxl: small build fix to pass uint8_t to tolower().

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

diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 5c84d33e1d06c08ffaf4adf2a2eadc9bad062c31..76b8b9972fc5b19d944427f8be410d258e57d20d 100644 (file)
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -1226,7 +1226,7 @@ static int64_t parse_mem_size_kb(char *mem)
     if (strlen(endptr) > 1)
         return -1;
 
-    switch (tolower(*endptr)) {
+    switch (tolower((uint8_t)*endptr)) {
     case 't':
         kbytes <<= 10;
     case 'g':