fix(iobackend): missing header

src/io_backend/io_backend.c

@@ -125,7 +125,7 @@ int iob_config_from_args(struct args_options *args, struct iob_context *ctx)
         break;
 
     default:
-        return -1;
+        return IOB_ERROR_GENERIC;
     }
     return 0;
-}
+}

src/io_backend/io_backend.h

@@ -2,6 +2,7 @@
 #define IO_BACKEND_H
 
 #include <sys/types.h>
+#include "utils/args/args.h"
 
 // Error codes
 #define IOB_ERROR_GENERIC -1