tests: fix negated test_i18ngrep calls

The helper function test_i18ngrep pretends that it found the expected
results when it is running under GETTEXT_POISON. For this reason, it must
not be used negated like so

   ! test_i18ngrep foo bar

because the test case would fail under GETTEXT_POISON. The function offers
a special syntax to test that a pattern is *not* found:

   test_i18ngrep ! foo bar

Convert incorrect uses to this syntax.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t4018-diff-funcname.sh

@@ -52,15 +52,15 @@ do
 		echo "*.java diff=$p" >.gitattributes &&
 		test_expect_code 1 git diff --no-index \
 			A.java B.java 2>msg &&
-		! test_i18ngrep fatal msg &&
-		! test_i18ngrep error msg
+		test_i18ngrep ! fatal msg &&
+		test_i18ngrep ! error msg
 	'
 	test_expect_success "builtin $p wordRegex pattern compiles" '
 		echo "*.java diff=$p" >.gitattributes &&
 		test_expect_code 1 git diff --no-index --word-diff \
 			A.java B.java 2>msg &&
-		! test_i18ngrep fatal msg &&
-		! test_i18ngrep error msg
+		test_i18ngrep ! fatal msg &&
+		test_i18ngrep ! error msg
 	'
 done
 

t/t9800-git-p4-basic.sh

@@ -145,7 +145,7 @@ test_expect_success 'exit when p4 fails to produce marshaled output' '
 		test_expect_code 1 git p4 clone --dest="$git" //depot >errs 2>&1
 	) &&
 	cat errs &&
-	! test_i18ngrep Traceback errs
+	test_i18ngrep ! Traceback errs
 '
 
 # Hide a file from p4d, make sure we catch its complaint.  This won't fail in

t/t9807-git-p4-submit.sh

@@ -404,7 +404,7 @@ test_expect_success 'submit --prepare-p4-only' '
 		git p4 submit --prepare-p4-only >out &&
 		test_i18ngrep "prepared for submission" out &&
 		test_i18ngrep "must be deleted" out &&
-		! test_i18ngrep "everything below this line is just the diff" out
+		test_i18ngrep ! "everything below this line is just the diff" out
 	) &&
 	(
 		cd "$cli" &&