[PATCH] Fix crash in f-typeprint.c

[Tom Tromey <tom@tromey.com>]

I noticed a crash in f-typeprint.c that was hidden by an xfail:

XFAIL: gdb.fortran/vla-array.exp: print variable length string array type (GDB internal error) (PRMS gcc/101826)

I think this was introduced by commit 6594ca4a ("do not handle a NULL
linebuffer in pager_file::puts") but not detected due to the xfail.

It seems bad for an xfail to cover up a crash but I haven't
investigated that.

Meanwhile, this patch fixes the crash by checking for a NULL pointer
when calling gdb_puts.
---
 gdb/f-typeprint.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/gdb/f-typeprint.c b/gdb/f-typeprint.c
index e96d27c537e..65c58b59b2d 100644
--- a/gdb/f-typeprint.c
+++ b/gdb/f-typeprint.c
@@ -414,7 +414,8 @@ f_language::f_type_print_base (struct type *type, struct ui_file *stream,
 
       gdb_puts (" ", stream);
 
-      gdb_puts (type->name (), stream);
+      if (type->name () != nullptr)
+	gdb_puts (type->name (), stream);
 
       /* According to the definition,
 	 we only print structure elements in case show > 0.  */
@@ -432,7 +433,8 @@ f_language::f_type_print_base (struct type *type, struct ui_file *stream,
 	      gdb_puts ("\n", stream);
 	    }
 	  gdb_printf (stream, "%*sEnd Type ", level, "");
-	  gdb_puts (type->name (), stream);
+	  if (type->name () != nullptr)
+	    gdb_puts (type->name (), stream);
 	}
       break;
 
-- 
2.49.0