Fix misleading error message in btrfsctl

This updates Peter Klotz's original patch to use perror instead of fprintf
when it fails to open /dev/btrfs-control

1 files changed, 4 insertions, 0 deletions

diff --git a/btrfsctl.c b/btrfsctl.c
index e0497992..df1a1657 100644
--- a/btrfsctl.c
+++ b/btrfsctl.c
@@ -189,6 +189,10 @@ int main(int ac, char **av)
 
 	if (command == BTRFS_IOC_SCAN_DEV) {
 		fd = open("/dev/btrfs-control", O_RDWR);
+		if (fd < 0) {
+			perror("failed to open /dev/btrfs-control");
+			exit(1);
+		}
 		name = fname;
 	 } else {
 		fd = open_file_or_dir(fname);