lseek: return -1 instead of -errno

The patch making errno a positive value has another bug:
lseek was switched to return -errno instead of -1. This does not
work since we can lseek we can address the whole 4G address space,
have of which has a negative offset when interpreted as a signed
integer. Let lseek return -1 on failure again instead.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands/crc.c

@@ -48,7 +48,7 @@ static int file_crc(char* filename, ulong start, ulong size, ulong *crc,
 
 	if (start > 0) {
 		ret = lseek(fd, start, SEEK_SET);
-		if (ret < 0) {
+		if (ret == -1) {
 			perror("lseek");
 			goto out;
 		}

commands/mem.c

@@ -122,10 +122,10 @@ static int open_and_lseek(const char *filename, int mode, off_t pos)
 		return fd;
 
 	ret = lseek(fd, pos, SEEK_SET);
-	if (ret < 0) {
+	if (ret == -1) {
 		perror("lseek");
 		close(fd);
-		return ret;
+		return -errno;
 	}
 
 	return fd;

fs/fs.c

@@ -732,13 +732,13 @@ off_t lseek(int fildes, off_t offset, int whence)
 		goto out;
 	}
 
-	ret = fsdrv->lseek(dev, f, pos);
+	return fsdrv->lseek(dev, f, pos);
 
 out:
 	if (ret)
 		errno = -ret;
 
-	return ret;
+	return -1;
 }
 EXPORT_SYMBOL(lseek);