Fix output descriptors of c_{s,d,c,z}blat3

The NTRA argument can be equal to -1 if one does not want a snapshot file
(and this is the case with sample data {s,d,c,z}in3).
The routines {S,D,C,Z}PRCN3 will try to use their first argument as an output
unit number, so we avoid calling them when NTRA < 0.

Patch originally written by Camm Maguire.

ctest/c_cblat3.f

@@ -1365,8 +1365,9 @@
 *
   150 CONTINUE
       WRITE( NOUT, FMT = 9996 )SNAME
-      CALL CPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
-     $      M, N, ALPHA, LDA, LDB)
+      IF( TRACE )
+     $   CALL CPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
+     $         M, N, ALPHA, LDA, LDB)
 *
   160 CONTINUE
       RETURN

ctest/c_cblat3_3m.f

@@ -1365,8 +1365,9 @@
 *
   150 CONTINUE
       WRITE( NOUT, FMT = 9996 )SNAME
-      CALL CPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
-     $      M, N, ALPHA, LDA, LDB)
+      IF( TRACE )
+     $   CALL CPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
+     $         M, N, ALPHA, LDA, LDB)
 *
   160 CONTINUE
       RETURN

ctest/c_dblat3.f

@@ -1335,8 +1335,9 @@
 *
   150 CONTINUE
       WRITE( NOUT, FMT = 9996 )SNAME
-      CALL DPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
-     $      M, N, ALPHA, LDA, LDB)
+      IF( TRACE )
+     $   CALL DPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
+     $         M, N, ALPHA, LDA, LDB)
 *
   160 CONTINUE
       RETURN

ctest/c_sblat3.f

@@ -1339,8 +1339,9 @@
 *
   150 CONTINUE
       WRITE( NOUT, FMT = 9996 )SNAME
-      CALL SPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
-     $      M, N, ALPHA, LDA, LDB)
+      IF( TRACE )
+     $   CALL SPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
+     $         M, N, ALPHA, LDA, LDB)
 *
   160 CONTINUE
       RETURN

ctest/c_zblat3.f

@@ -1366,8 +1366,9 @@
 *
   150 CONTINUE
       WRITE( NOUT, FMT = 9996 )SNAME
-      CALL ZPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
-     $      M, N, ALPHA, LDA, LDB)
+      IF( TRACE )
+     $   CALL ZPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
+     $         M, N, ALPHA, LDA, LDB)
 *
   160 CONTINUE
       RETURN

ctest/c_zblat3_3m.f

@@ -1366,8 +1366,9 @@
 *
   150 CONTINUE
       WRITE( NOUT, FMT = 9996 )SNAME
-      CALL ZPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
-     $      M, N, ALPHA, LDA, LDB)
+      IF( TRACE )
+     $   CALL ZPRCN3( NTRA, NC, SNAME, IORDER, SIDE, UPLO, TRANSA, DIAG,
+     $         M, N, ALPHA, LDA, LDB)
 *
   160 CONTINUE
       RETURN