Fix 24d0e21f51 correctly

CreateSubRequest() could still return an error and break out of the
while loop without exiting the outer for loop.

Instead we reset the error code before entering the for loop.

src/system/kernel/fs/vfs_request_io.cpp

@@ -163,9 +163,14 @@ do_iterative_fd_io_iterate(void* _cookie, io_request* request,
 	}
 	TRACE_RIO("[%ld]  got %zu file vecs\n", find_thread(NULL), vecCount);
 
+	// Reset the error code for the loop below
+	error = B_OK;
+
 	// create subrequests for the file vecs we've got
 	size_t subRequestCount = 0;
-	for (size_t i = 0; i < vecCount && subRequestCount < kMaxSubRequests; i++) {
+	for (size_t i = 0;
+		i < vecCount && subRequestCount < kMaxSubRequests && error == B_OK;
+		i++) {
 		off_t vecOffset = vecs[i].offset;
 		off_t vecLength = min_c(vecs[i].length, (off_t)requestLength);
 		TRACE_RIO("[%ld]    vec %lu offset: %lld, length: %lld\n",