util: fix releasing pidfile in cleanup

Coverity found out the very obvious problem in the code.  That is that
virPidFileReleasePath() was called only if
virPidFileAcquirePath() returned 0.  But virPidFileAcquirePath() doesn't
return only 0 on success, but the FD that needs to be closed.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

src/util/virpidfile.c

@@ -592,9 +592,8 @@ virPidFileForceCleanupPath(const char *path)
     if (virPidFileReadPath(path, &pid) < 0)
         return -1;
 
-    if (virPidFileAcquirePath(path, false, 0) == 0) {
-        virPidFileReleasePath(path, fd);
-    } else {
+    fd = virPidFileAcquirePath(path, false, 0);
+    if (fd < 0) {
         virResetLastError();
 
         /* Only kill the process if the pid is valid one.  0 means
@@ -607,5 +606,8 @@ virPidFileForceCleanupPath(const char *path)
             return -1;
     }
 
+    if (fd)
+        virPidFileReleasePath(path, fd);
+
     return 0;
 }