libf2fs: avoid build warning

This avoids the below warnings.

libf2fs_zoned.c:39:8: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
fscanf(file, "%s", str);
      ^
libf2fs_zoned.c: In function 'f2fs_get_zone_blocks':
libf2fs_zoned.c:72:8: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
fscanf(file, "%s", str);
      ^

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/lib/libf2fs_zoned.c b/lib/libf2fs_zoned.c
index 4ef4f1d..93b48f1 100644 (file)
--- a/lib/libf2fs_zoned.c
+++ b/lib/libf2fs_zoned.c
@@ -26,6 +26,7 @@ void f2fs_get_zoned_model()
 {
        char str[128];
        FILE *file;
+       int res;
 
        /* Check that this is a zoned block device */
        snprintf(str, sizeof(str),
@@ -36,9 +37,12 @@ void f2fs_get_zoned_model()
                goto not_zoned;
 
        memset(str, 0, sizeof(str));
-       fscanf(file, "%s", str);
+       res = fscanf(file, "%s", str);
        fclose(file);
 
+       if (res != 1)
+               goto not_zoned;
+
        if (strcmp(str, "host-aware") == 0) {
                c.zoned_model = F2FS_ZONED_HA;
                return;
@@ -57,6 +61,7 @@ int f2fs_get_zone_blocks()
        uint64_t sectors;
        char str[128];
        FILE *file;
+       int res;
 
        /* Get zone size */
        c.zone_blocks = 0;
@@ -69,9 +74,12 @@ int f2fs_get_zone_blocks()
                return -1;
 
        memset(str, 0, sizeof(str));
-       fscanf(file, "%s", str);
+       res = fscanf(file, "%s", str);
        fclose(file);
 
+       if (res != 1)
+               return -1;
+
        sectors = atol(str);
        if (!sectors)
                return -1;