[RFA] Fix scm-ports.exp regression

[Tom Tromey <tom@tromey.com>]

In https://sourceware.org/ml/gdb-patches/2017-12/msg00215.html, Jan
pointed out that the scalar printing patches caused a regression in
scm-ports.exp on x86.

I think the simplest fix is to use "print/u" rather than "print/d" to
get the value of sp_reg in the test case.

Tested on x86-64 Fedora 26 using an ordinary build and also a -m32
build.

2018-01-03  Tom Tromey  <tom@tromey.com>

	* gdb.guile/scm-ports.exp (test_mem_port_rw): Use get_valueof to
	compute sp_reg.
---
 gdb/testsuite/ChangeLog               | 5 +++++
 gdb/testsuite/gdb.guile/scm-ports.exp | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 500dbddf1c..e3903cca6b 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-01-03  Tom Tromey  <tom@tromey.com>
+
+	* gdb.guile/scm-ports.exp (test_mem_port_rw): Use get_valueof to
+	compute sp_reg.
+
 2018-01-03  Xavier Roirand  <roirand@adacore.com>
 
 	* gdb.ada/excep_handle.exp: New testcase.
diff --git a/gdb/testsuite/gdb.guile/scm-ports.exp b/gdb/testsuite/gdb.guile/scm-ports.exp
index 48af5e30e1..04170ef4b8 100644
--- a/gdb/testsuite/gdb.guile/scm-ports.exp
+++ b/gdb/testsuite/gdb.guile/scm-ports.exp
@@ -104,7 +104,7 @@ proc test_mem_port_rw { kind } {
 	    "get sp reg"
 	# Note: Only use $sp_reg for gdb_test result matching, don't use it in
 	# gdb commands.  Otherwise transcript.N becomes unusable.
-	set sp_reg [get_integer_valueof "\$sp" 0]
+	set sp_reg [get_valueof /u "\$sp" 0]
 	gdb_test_no_output "guile (define byte-at-sp (parse-and-eval \"*(char*) \$sp\"))" \
 	    "save current value at sp"
 	# Pass the result of parse-and-eval through value-fetch-lazy!,
-- 
2.13.6