git: d851e0070499 - stable/15 - ngctl: Fix getline loop

The branch stable/15 has been updated by des:

URL: https://cgit.FreeBSD.org/src/commit/?id=d851e0070499b8b34f3cf1efb956aefa6faf6859

commit d851e0070499b8b34f3cf1efb956aefa6faf6859
Author:     Dag-Erling Smørgrav <des@FreeBSD.org>
AuthorDate: 2026-02-24 14:23:39 +0000
Commit:     Dag-Erling Smørgrav <des@FreeBSD.org>
CommitDate: 2026-02-27 10:05:26 +0000

    ngctl: Fix getline loop
    
    I misremembered when I wrote this code: getline() returns -1 on EOF, not
    zero, so the loop condition and the error check are both incorrect
    (though in practice getline() will never return 0).
    
    MFC after:      3 days
    Fixes:          3cbdcabf714d ("ngctl: Modernize code somewhat")
    Reviewed by:    markj
    Differential Revision:  https://reviews.freebsd.org/D55487
    
    (cherry picked from commit 6c4777c59325c2cfefcce0c466b3bf475404a550)
---
 usr.sbin/ngctl/main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/usr.sbin/ngctl/main.c b/usr.sbin/ngctl/main.c
index b58de1e042b3..2b711fd4155a 100644
--- a/usr.sbin/ngctl/main.c
+++ b/usr.sbin/ngctl/main.c
@@ -243,7 +243,7 @@ ReadFile(FILE *fp)
 	unsigned int lineno = 0;
 	int rtn = CMDRTN_OK;
 
-	while ((len = getline(&line, &sz, fp)) > 0) {
+	while ((len = getline(&line, &sz, fp)) >= 0) {
 		lineno++;
 		if (*line == '#')
 			continue;
@@ -252,7 +252,7 @@ ReadFile(FILE *fp)
 			break;
 		}
 	}
-	if (len < 0)
+	if (ferror(fp))
 		rtn = CMDRTN_ERROR;
 	free(line);
 	return (rtn);