Fix a tiny bug in shlib support of ldd(1); if dlopen(lib, RTLD_TRACE)

returns, exit gracefully with 0.

This fixes the behavior you see when you specify libc.so.  It occurs
because ldd(1) itself is linked with libc.so.

	$ ldd /usr/lib/libc.so
	/usr/lib/libc.so:
	ldd: /usr/lib/libc.so: (null)
	/usr/lib/libc.so: exit status 1

Reviewed by:	silence of audit@

1 files changed, 5 insertions, 4 deletions

diff --git a/usr.bin/ldd/ldd.c b/usr.bin/ldd/ldd.c
index 8e5e5d2..68f9988 100644
--- a/usr.bin/ldd/ldd.c
+++ b/usr.bin/ldd/ldd.c
@@ -220,12 +220,13 @@ main(int argc, char *argv[])
 			}
 			break;
 		case 0:
-			if (is_shlib == 0) {
+			if (is_shlib) {
+				if (dlopen(*argv, RTLD_TRACE))
+					_exit(0);	/* libc.so */
+				warnx("%s: %s", *argv, dlerror());
+			} else {
 				execl(*argv, *argv, (char *)NULL);
 				warn("%s", *argv);
-			} else {
-				dlopen(*argv, RTLD_TRACE);
-				warnx("%s: %s", *argv, dlerror());
 			}
 			_exit(1);
 		}