command: avoid double close in virExecWithHook

Fix possible double close in the child process after the fork in case
infd and outfd are equal, just like they are after being called from
virNetSocketNewConnectCommand.

src/util/command.c

@@ -547,17 +547,13 @@ virExecWithHook(const char *const*argv,
         goto fork_error;
     }
 
-    if (infd != STDIN_FILENO && infd != null)
+    if (infd != STDIN_FILENO && infd != null && infd != childerr &&
+        infd != childout)
         VIR_FORCE_CLOSE(infd);
-    if (childout > STDERR_FILENO && childout != null) {
-        tmpfd = childout;   /* preserve childout value */
-        VIR_FORCE_CLOSE(tmpfd);
-    }
-    if (childerr > STDERR_FILENO &&
-        childerr != childout &&
-        childerr != null) {
+    if (childout > STDERR_FILENO && childout != null && childout != childerr)
+        VIR_FORCE_CLOSE(childout);
+    if (childerr > STDERR_FILENO && childerr != null)
         VIR_FORCE_CLOSE(childerr);
-    }
     VIR_FORCE_CLOSE(null);
 
     /* Initialize full logging for a while */