Use semicolon after "return" statement in core m-files. * scripts/general/accumdim.m, scripts/image/imformats.m, scripts/io/textread.m, scripts/io/textscan.m, scripts/linear-algebra/expm.m, scripts/miscellaneous/edit.m, scripts/optimization/lsqnonneg.m, scripts/optimization/pqpnonneg.m, scripts/pkg/private/dirempty.m, scripts/plot/findobj.m, scripts/plot/graphics_toolkit.m, scripts/plot/private/__errplot__.m, scripts/plot/private/__interp_cube__.m, scripts/plot/private/__marching_cube__.m, scripts/plot/subplot.m, scripts/polynomial/residue.m, scripts/sparse/sprandsym.m, scripts/special-matrix/gallery.m, scripts/strings/strjoin.m: Use semicolon after "return" statement in core m-files.

--- a/scripts/sparse/sprandsym.m
+++ b/scripts/sparse/sprandsym.m
@@ -121,7 +121,7 @@
   ## Degenerate case
   if (k == 1)
     r = 1;
-    return
+    return;
   endif
 
   ## Compute the stuff described above