Use filtered output in print_i387_ext

print_i387_ext mostly uses filtered output, but one call in the middle
of the function uses the _unfiltered form.  This patch fixes this
call.  I'm checking this in as obvious.
diff --git a/gdb/i387-tdep.c b/gdb/i387-tdep.c
index e25fdd7..2f0b650 100644
--- a/gdb/i387-tdep.c
+++ b/gdb/i387-tdep.c
@@ -70,7 +70,7 @@ print_i387_ext (struct gdbarch *gdbarch,
 	fprintf_filtered (file, " %cInf", (sign ? '-' : '+'));
       else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000)
 	/* Real Indefinite (QNaN).  */
-	fputs_unfiltered (" Real Indefinite (QNaN)", file);
+	fputs_filtered (" Real Indefinite (QNaN)", file);
       else if (fraction[1] & 0x40000000)
 	/* QNaN.  */
 	fputs_filtered (" QNaN", file);