lib/60599: getfsspecname(3) returns ESRCH instead of ENOENT

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>Number:         60599
>Category:       lib
>Synopsis:       getfsspecname(3) returns ESRCH instead of ENOENT
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    lib-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Sat Aug 15 09:20:01 +0000 2026
>Originator:     RVP
>Release:        11.99.7
>Organization:
>Environment:
NetBSD CoreBook.local 11.99.7 NetBSD 11.99.7 (COREBOOK_DIAG) #0: Sat Aug 15 04:21:15 UTC 2026  bld@CoreBook.local:/tmp/obj/usr/src/sys/arch/amd64/compile/COREBOOK_DIAG amd64
>Description:
The return value of getfsspecname(3) when a label cannot be looked up
is a bit confusing:

```
$ sudo mount -r NAME=doesnotexist /mnt
mount: no match for `doesnotexist': No such process
$
```

`No such process'? Wat? There be no "process" here, mon.
>How-To-Repeat:
As above.
>Fix:
---START patch---
--- lib/libutil/getfsspecname.c.orig	2018-12-27 21:35:48.000000000 +0000
+++ lib/libutil/getfsspecname.c	2026-08-13 02:15:29.812375998 +0000
@@ -135,13 +135,16 @@
 		goto out;
 	}
 
+	savee = 0;
 	for (dk = strtok(drives, " "); dk != NULL; dk = strtok(NULL, " ")) {
 		struct dkwedge_info dkw;
 		if (strncmp(dk, "dk", 2) != 0)
 			continue;
 		fd = opendisk(dk, O_RDONLY, buf, bufsiz, 0);
-		if (fd == -1)
+		if (fd == -1) {
+			savee = errno;
 			continue;
+		}
 		if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == -1) {
 			savee = errno;
 			snprintf(buf, bufsiz, "%s: getwedgeinfo", dk);
@@ -161,9 +164,11 @@
 		close(fd);
 		p = strstr(buf, "/r");
 		goto good;
-	}
+	} else
+		savee = errno;
 #endif
-	savee = ESRCH;
+	if (savee == 0)
+		savee = ENOENT;
 	snprintf(buf, bufsiz, "no match for `%s'", vname);
 out:
 	buf = NULL;
---END patch---