[PATCH] tools: env: fw_env: Fix unused-result warning

[Jaehoon Chung]

Fix unused-result warning about fread.

tools/env/fw_env.c: In function ‘find_nvmem_device’:
tools/env/fw_env.c:1751:3: warning: ignoring return value of ‘fread’, declared 
with attribute warn_unused_result [-Wunused-result]
 1751 |   fread(buf, sizeof(buf), 1, fp);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Jaehoon Chung <jh80.ch...@samsung.com>
---
 tools/env/fw_env.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index c251e2e6ba7d..c9a8774acefb 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -1733,6 +1733,7 @@ static int find_nvmem_device(void)
 
        while (!nvmem && (dent = readdir(dir))) {
                FILE *fp;
+               size_t size;
 
                if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, "..")) {
                        continue;
@@ -1748,7 +1749,14 @@ static int find_nvmem_device(void)
                        continue;
                }
 
-               fread(buf, sizeof(buf), 1, fp);
+               size = fread(buf, sizeof(buf), 1, fp);
+               if (size != 1) {
+                       fprintf(stderr,
+                               "read failed about %s\n", comp);
+                       fclose(fp);
+                       return -EIO;
+               }
+
 
                if (!strcmp(buf, "u-boot,env")) {
                        bytes = asprintf(&nvmem, "%s/%s/nvmem", path, 
dent->d_name);
-- 
2.25.1