Fix the build.

Change-Id: I87216d4a349fa7cb297c502a90cb54c02b9b4445

internal/ceres/compressed_row_sparse_matrix.cc

diff --git a/internal/ceres/compressed_row_sparse_matrix.cc b/internal/ceres/compressed_row_sparse_matrix.cc
index 7109378..40cdd10 100644
--- a/internal/ceres/compressed_row_sparse_matrix.cc
+++ b/internal/ceres/compressed_row_sparse_matrix.cc
@@ -872,7 +872,7 @@
   // It is possible that the random matrix is empty which is likely
   // not what the user wants, so do the matrix generation till we have
   // at least one non-zero entry.
-  while (tsm_values.size().empty()) {
+  while (tsm_values.empty()) {
     int row_block_begin = 0;
     crsb_rows.clear();
     crsb_cols.clear();