style: rename cleanup_caret as caret_free

* src/location.c, src/location.h, src/main.c: here.

src/location.c

@@ -150,7 +150,7 @@ struct caret_info
 static struct caret_info caret_info = { NULL, 1, 0 };
 
 void
-cleanup_caret ()
+caret_free ()
 {
   if (caret_info.source)
     fclose (caret_info.source);

src/location.h

@@ -110,7 +110,7 @@ unsigned location_print (location loc, FILE *out);
 
 /* Free any allocated resources and close any open file handles that are
    left-over by the usage of location_caret.  */
-void cleanup_caret (void);
+void caret_free (void);
 
 /* Output to OUT the line and caret corresponding to location LOC.  */
 void location_caret (location loc, FILE *out);

src/main.c

@@ -234,7 +234,7 @@ main (int argc, char *argv[])
   timevar_stop (tv_total);
   timevar_print (stderr);
 
-  cleanup_caret ();
+  caret_free ();
 
   /* Fix input file now, even if there are errors: that's less
      warnings in the following runs.  */