same change to stgex2

Author: soypat

SRC/stgex2.f

@@ -255,7 +255,7 @@ SUBROUTINE STGEX2( WANTQ, WANTZ, N, A, LDA, B, LDB, Q, LDQ, Z,
      $                   THRESHA, THRESHB
 *     ..
 *     .. Local Arrays ..
-      INTEGER            IWORK( LDST )
+      INTEGER            IWORK( LDST + 2 )
       REAL               AI( 2 ), AR( 2 ), BE( 2 ), IR( LDST, LDST ),
      $                   IRCOP( LDST, LDST ), LI( LDST, LDST ),
      $                   LICOP( LDST, LDST ), S( LDST, LDST ),