Fix workspace query corner cases to always return at least 1

lapack-netlib/SRC/strevc3.f

@@ -298,7 +298,7 @@
 *
       INFO = 0
       NB = ILAENV( 1, 'STREVC', SIDE // HOWMNY, N, -1, -1, -1 )
-      MAXWRK = N + 2*N*NB
+      MAXWRK = MAX( 1, N + 2*N*NB )
       WORK(1) = MAXWRK
       LQUERY = ( LWORK.EQ.-1 )
       IF( .NOT.RIGHTV .AND. .NOT.LEFTV ) THEN