Check all lseek calls succeed.

Also add missing TEMP_FAILURE_RETRYs on read, write, and lseek.

Bug: http://b/20625546
Change-Id: I03b198e11c1921b35518ee2dd005a7cfcf4fd94b

tools/ota/check-lost+found.c

@@ -78,7 +78,7 @@ int main(int argc __attribute__((unused)), char **argv __attribute__((unused)))
                 snprintf(fn, sizeof(fn), "%s/%s", kPartitions[i], "dirty");
                 fd = open(fn, O_WRONLY|O_CREAT, 0444);
                 if (fd >= 0) {  // Don't sweat it if we can't write the file.
-                    write(fd, fn, sizeof(fn));  // write, you know, some data
+                    TEMP_FAILURE_RETRY(write(fd, fn, sizeof(fn)));  // write, you know, some data
                     close(fd);
                     unlink(fn);
                 }