qemu-option: Replace pointless use of g_malloc0() by g_malloc()

get_opt_value() takes a write-only buffer, so zeroing it is pointless.
We don't do it elsewhere, either.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NGonglei <arei.gonglei@huawei.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

util/qemu-option.c

@@ -213,7 +213,7 @@ void parse_option_size(const char *name, const char *value,
 bool has_help_option(const char *param)
 {
     size_t buflen = strlen(param) + 1;
-    char *buf = g_malloc0(buflen);
+    char *buf = g_malloc(buflen);
     const char *p = param;
     bool result = false;
 
@@ -237,7 +237,7 @@ out:
 bool is_valid_option_list(const char *param)
 {
     size_t buflen = strlen(param) + 1;
-    char *buf = g_malloc0(buflen);
+    char *buf = g_malloc(buflen);
     const char *p = param;
     bool result = true;