[PATCH] libf2fs: avoid build warning

[Jaegeuk Kim <jaegeuk@kernel.org>]

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>
---
 lib/libf2fs_zoned.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/libf2fs_zoned.c b/lib/libf2fs_zoned.c
index 4ef4f1d..93b48f1 100644
--- 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;
-- 
2.8.3


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