qemu-config: introduce qemu_find_opts_err()

This is like qemu_find_opts(), except that it takes an Error argument.

This new function allows for a incremental conversion of code using
qemu_find_opts().
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
Reviewed-By: NLaszlo Ersek <lersek@redhat.com>

qemu-config.c

@@ -661,6 +661,11 @@ QemuOptsList *qemu_find_opts(const char *group)
     return ret;
 }
 
+QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
+{
+    return find_list(vm_config_groups, group, errp);
+}
+
 void qemu_add_opts(QemuOptsList *list)
 {
     int entries, i;

qemu-config.h

 #ifndef QEMU_CONFIG_H
 #define QEMU_CONFIG_H
 
+#include "error.h"
+
 extern QemuOptsList qemu_fsdev_opts;
 extern QemuOptsList qemu_virtfs_opts;
 extern QemuOptsList qemu_spice_opts;
 
 QemuOptsList *qemu_find_opts(const char *group);
+QemuOptsList *qemu_find_opts_err(const char *group, Error **errp);
 void qemu_add_opts(QemuOptsList *list);
 int qemu_set_option(const char *str);
 int qemu_global_option(const char *str);