Fix dumpstate read_file_as_long fd leak

Change-Id: If572b05b662695d007854340db0a6d9fb0a7c60d
Signed-off-by: luoqiangwei1 <luoqiangwei1@xiaomi.com>

Author: luoqiangwei1

cmds/dumpstate/dumpstate.cpp

@@ -4144,14 +4144,14 @@ int Dumpstate::DumpFile(const std::string& title, const std::string& path) {
 }
 
 int read_file_as_long(const char *path, long int *output) {
-    int fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC));
-    if (fd < 0) {
+    android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC)));
+    if (fd.get() < 0) {
         int err = errno;
         MYLOGE("Error opening file descriptor for %s: %s\n", path, strerror(err));
         return -1;
     }
     char buffer[50];
-    ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, sizeof(buffer)));
+    ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd.get(), buffer, sizeof(buffer)));
     if (bytes_read == -1) {
         MYLOGE("Error reading file %s: %s\n", path, strerror(errno));
         return -2;