[PATCH] perf: fix test_export with SHELL=zsh

Unlike other shells, zsh doesn't do word-splitting on variables.  This
is documented in https://zsh.sourceforge.io/FAQ/zshfaq03.html#31.  That
breaks the perf function test_export because it uses a space-separated
variable as a poor man's array, and as a consequence p0000 fails with
"not ok 3 - test_export works".  Pass the value through an unquoted
command substitution to force word-splitting even in zsh.

Signed-off-by: René Scharfe <redacted>
---
 t/perf/perf-lib.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/perf/perf-lib.sh b/t/perf/perf-lib.sh
index f5ed092ee5..f74cfd35d6 100644
--- a/t/perf/perf-lib.sh
+++ b/t/perf/perf-lib.sh

@@ -165,7 +165,7 @@ test_export () {
 '"$1"'
 ret=$?
 needles=
-for v in $test_export_
+for v in $(echo "$test_export_")
 do
 	needles="$needles;s/^$v=/export $v=/p"
 done
--

2.33.0