Always call error with errno (not zero) after failed fclose or non-zero ferror.

src/cut.c

@@ -233,7 +233,7 @@ main (argc, argv)
       exit_status = 1;
     }
   if (ferror (stdout) || fclose (stdout) == EOF)
-    error (1, 0, "write error");
+    error (1, errno, "write error");
 
   exit (exit_status);
 }

src/expand.c

@@ -162,7 +162,7 @@ main (argc, argv)
   if (have_read_stdin && fclose (stdin) == EOF)
     error (1, errno, "-");
   if (ferror (stdout) || fclose (stdout) == EOF)
-    error (1, 0, "write error");
+    error (1, errno, "write error");
 
   exit (exit_status);
 }

src/join.c

@@ -664,7 +664,7 @@ main (argc, argv)
   if ((fp1 == stdin || fp2 == stdin) && fclose (stdin) == EOF)
     error (1, errno, "-");
   if (ferror (stdout) || fclose (stdout) == EOF)
-    error (1, 0, "write error");
+    error (1, errno, "write error");
 
   exit (0);
 }

src/nl.c

@@ -293,7 +293,7 @@ main (argc, argv)
       exit_status = 1;
     }
   if (ferror (stdout) || fclose (stdout) == EOF)
-    error (1, 0, "write error");
+    error (1, errno, "write error");
 
   exit (exit_status);
 }

src/sort.c

@@ -1727,7 +1727,7 @@ main (argc, argv)
   if (have_read_stdin && fclose (stdin) == EOF)
     error (1, errno, "-");
   if (ferror (stdout) || fclose (stdout) == EOF)
-    error (1, 0, "write error");
+    error (1, errno, "write error");
 
   exit (0);
 }