maint: miscellaneous style fixes for .m files * audio/mu2lin.m, deprecated/cut.m, general/cplxpair.m, general/genvarname.m, geometry/rectint.m, help/gen_doc_cache.m, image/hsv2rgb.m, image/rainbow.m, io/textscan.m, miscellaneous/bzip2.m, miscellaneous/compare_versions.m, miscellaneous/fact.m, miscellaneous/menu.m, optimization/fminbnd.m, optimization/fminunc.m, optimization/fzero.m, optimization/sqp.m, plot/__gnuplot_drawnow__.m, plot/axis.m, plot/findobj.m, plot/legend.m, plot/peaks.m, plot/private/__errplot__.m, plot/private/__fltk_print__.m, plot/private/__go_draw_axes__.m, plot/private/__patch__.m, polynomial/pchip.m, polynomial/residue.m, signal/periodogram.m, sparse/sprandsym.m, statistics/base/moment.m, statistics/distributions/expcdf.m, statistics/distributions/expinv.m, statistics/distributions/exppdf.m, statistics/tests/prop_test_2.m, statistics/tests/sign_test.m, statistics/tests/t_test.m, statistics/tests/t_test_2.m, statistics/tests/t_test_regression.m, strings/regexptranslate.m, time/datetick.m: Style fixes.

--- a/scripts/statistics/tests/sign_test.m
+++ b/scripts/statistics/tests/sign_test.m
@@ -68,9 +68,9 @@
   endif
   if (strcmp (alt, "!=") || strcmp (alt, "<>"))
     pval = 2 * min (cdf, 1 - cdf);
-  elseif strcmp (alt, ">")
+  elseif (strcmp (alt, ">"))
     pval = 1 - cdf;
-  elseif strcmp (alt, "<")
+  elseif (strcmp (alt, "<"))
     pval = cdf;
   else
     error ("sign_test: option %s not recognized", alt);