tests: remove the less-regular fail=0 assignments manually

* tests/tail-2/assert-2:
* tests/tail-2/assert:
* tests/cp/file-perm-race:
* tests/misc/df:
* tests/misc/truncate-dir-fail:

tests/cp/file-perm-race

@@ -23,7 +23,6 @@ fi
 
 . $srcdir/test-lib.sh
 
-fail=0
 umask 022
 mkfifo fifo ||
   skip_test_ "fifos not supported"
@@ -50,10 +49,8 @@ cp_pid=$!
 ) >fifo
 
 case `cat ls.out` in
--???------*)
-  fail=0;;
-*)
-  fail=1;;
+-???------*) ;;
+*) fail=1;;
 esac
 
 wait $cp_pid || fail=1

tests/misc/df

@@ -25,10 +25,8 @@ fi
 
 case `df .` in
 *'
-'*)
-  fail=0;;
-*)
-  fail=1;;
+'*) ;;
+*) fail=1;;
 esac
 
 Exit $fail

tests/misc/truncate-dir-fail

@@ -9,6 +9,6 @@ fi
 . $srcdir/test-lib.sh
 
 # truncate on dir not allowed
-truncate -s+0 . && fail=1 || fail=0
+truncate -s+0 . && fail=1
 
 Exit $fail

tests/tail-2/assert

@@ -55,7 +55,7 @@ mv f foo
 wait
 
 case "`cat err`" in
-  *$ok) fail=0;;
+  *$ok) ;;
   *) fail=1;;
 esac
 

tests/tail-2/assert-2

@@ -43,7 +43,7 @@ mv f foo
 wait
 
 case "`cat err`" in
-  *$ok) fail=0;;
+  *$ok) ;;
   *) fail=1;;
 esac