vfs_mountroot: Skip first 'Root mount waiting'

[cperciva]

Summary

While the message is technically correct, it's not particularly
helpful in the case where we're only waiting a few ms. This case
occurs frequently on EC2 arm64 instances with CAM initialization
racing to release its root hold before vfs_mountroot reaches this
point.

Sponsored by: https://www.patreon.com/cperciva

sys/kern/vfs_mountroot.c

default:
                 break;
 
         }
         return (error);
 }
 
 DEV_MODULE(dtrace_test, dtrace_test_modevent, NULL);
 MODULE_VERSION(dtrace_test, 1);
-MODULE_DEPEND(dtrace_test, dtraceall, 1, 1, 1);