Adjust dg-bogus pattern to match the text of the changed diagnostic.

gcc/testsuite:
	* gcc.dg/pr40340-3.c: Adjust directive pattern.
	* gcc.dg/pr40340-4.c: Same.

From-SVN: r246827

gcc/testsuite/ChangeLog

+2017-04-10  Martin Sebor  <msebor@redhat.com>
+
+	* gcc.dg/pr40340-3.c: Adjust directive pattern.
+	* gcc.dg/pr40340-4.c: Same.
+
 2017-04-10  Nicolas Koenig  <koenigni@student.ethz.ch>
 
 	PR fortran/69498

gcc/testsuite/gcc.dg/pr40340-3.c

@@ -12,4 +12,4 @@ main (void)
   return 0;
 }
 
-/* { dg-bogus "will always overflow destination buffer" "" { target *-*-* } 10 } */
+/* { dg-bogus "overflow" "" { target *-*-* } 10 } */

gcc/testsuite/gcc.dg/pr40340-4.c

@@ -13,4 +13,4 @@ main (void)
   return 0;
 }
 
-/* { dg-bogus "will always overflow destination buffer" "" { target *-*-* } 10 } */
+/* { dg-bogus "overflow" "" { target *-*-* } 10 } */