maint: Use semicolon for "return" statements.

* rat.m, print_usage.m, iqr.m: Use semicolon for "return" statements.

scripts/general/rat.m

@@ -128,7 +128,7 @@
       finish = repmat (")",         nn, 1);
       n = [start, realstr, mid, imagstr, finish];
     endif
-    return
+    return;
   endif
 
   y = x(:);

scripts/help/print_usage.m

@@ -194,7 +194,7 @@ function print_usage (name)
     ## There is some Texinfo command in the deftypefn line
     ## outside the scope of this restricted function,
     ## so return with status set to failure.
-    return
+    return;
   endif
 
   ## Process any remaining @ signs.

scripts/statistics/iqr.m

@@ -99,7 +99,7 @@
       sz(dim) = 1;
       z = NaN (sz);
     endif
-    return
+    return;
   endif
 
   else
@@ -114,7 +114,7 @@
           ## Handle empty x with input vecdim.
           sz(dim(dim <= nd)) = 1;
           z = NaN (sz);
-          return
+          return;
         endif
 
         ## Detect trivial case of DIM being all dimensions (same as "all").
@@ -169,7 +169,7 @@
         ## Handle empty x with scalar input dim.
         sz(dim(dim <= nd)) = 1;
         z = NaN (sz);
-        return
+        return;
       endif
 
     elseif (strcmp (lower (dim), "all"))
@@ -181,7 +181,7 @@
       if (empty_x)
         ## Handle empty x with "all" dim input.
         z = NaN;
-        return
+        return;
       endif
 
     else