fix txfree() prototype

ChangeLog

@@ -1,3 +1,7 @@
+2010-08-15  Robert Larice
+ * src/maths/sparse/spdefs.h :
+    fix txfree() prototype
+
 2010-08-13  Holger Vogt
  * autogen.sh: keep configure.in untouched by generating temporary 
    configure.ac if --adms is selected

src/maths/sparse/spdefs.h

@@ -369,7 +369,7 @@ typedef  struct
 /* Allocation */
 
 extern void * tmalloc(size_t);
-extern void * txfree(void *);
+extern void   txfree(void *);
 extern void * trealloc(void *, size_t);
 
 #define ALLOC(type,number)  ((type *)tmalloc((size_t)(sizeof(type)*(number))))