Suppress warning during initial clone of ABC repo

9dedac50 introduced this harmless but disconcerting warning, which was emitted
when abc/ did not yet exist and was about to be cloned:

/bin/sh: line 0: cd: abc: No such file or directory

diff --git a/Makefile b/Makefile
index a481dd92b544b5c7bcf118651aa3ac8acbf5ac97..01821e00e2376758287e2b8bddbdad931867389d 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -717,7 +717,7 @@ ifneq ($(ABCREV),default)
                echo 'REEBE: NOP pbagnvaf ybpny zbqvsvpngvbaf! Frg NOPERI=qrsnhyg va Lbflf Znxrsvyr!' | tr 'A-Za-z' 'N-ZA-Mn-za-m'; false; \
        fi
 # set a variable so the test fails if git fails to run - when comparing outputs directly, empty string would match empty string
-       $(Q) if ! (cd abc && rev="`git rev-parse $(ABCREV)`" && test "`git rev-parse HEAD`" == "$$rev"); then \
+       $(Q) if ! (cd abc 2> /dev/null && rev="`git rev-parse $(ABCREV)`" && test "`git rev-parse HEAD`" == "$$rev"); then \
                test $(ABCPULL) -ne 0 || { echo 'REEBE: NOP abg hc gb qngr naq NOPCHYY frg gb 0 va Znxrsvyr!' | tr 'A-Za-z' 'N-ZA-Mn-za-m'; exit 1; }; \
                echo "Pulling ABC from $(ABCURL):"; set -x; \
                test -d abc || git clone $(ABCURL) abc; \