t3305: fix ignored exit code inside loop

When we test deleting notes, we run "git notes remove" in a
loop. However, the exit value of the loop will only reflect
the final note we process. We should break out of the loop
with a failing exit code as soon as we see a problem.

Note that we can call "exit 1" here without explicitly
creating a subshell, because the while loop on the
right-hand side of a pipe executes in its own implicit
subshell.

Note also that the "break" above does not suffer the same
problem; it is meant to exit the loop early at a certain
number of iterations. We can bump it into the conditional of
the loop to make this more obvious.

Signed-off-by: Jeff King <peff@peff.net>
Acked-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t3305-notes-fanout.sh

@@ -51,15 +51,12 @@ test_expect_success 'deleting most notes with git-notes' '
 	num_notes=250 &&
 	i=0 &&
 	git rev-list HEAD |
-	while read sha1
+	while test $i -lt $num_notes && read sha1
 	do
 		i=$(($i + 1)) &&
-		if test $i -gt $num_notes
-		then
-			break
-		fi &&
 		test_tick &&
-		git notes remove "$sha1"
+		git notes remove "$sha1" ||
+		exit 1
 	done
 '