[testsuite,committed] Fix prototype of memset in a test case.

[Georg-Johann Lay]

One test case used unsigned long for the 3rd parameter of memset, which 
should be size_t.  This made the test crash for targets where correct 
parameter passing depends on correct prototypes.

Fixed and committed as obvious.
Johann


gcc/testsuite/
        * gcc.c-torture/execute/pr30778.c (memset): Use size_t for 3rd
        parameter in declaration.

Index: gcc.c-torture/execute/pr30778.c
===================================================================
--- gcc.c-torture/execute/pr30778.c     (revision 242541)
+++ gcc.c-torture/execute/pr30778.c     (working copy)
@@ -1,4 +1,4 @@
-extern void *memset (void *, int, unsigned long);
+extern void *memset (void *, int, __SIZE_TYPE__);
 extern void abort (void);

 struct reg_stat {