[gdb/testsuite] Fix ls_host return in index-cache.exp

When adding a debug print here in index-cache.exp:
...
 proc_with_prefix test_cache_disabled { cache_dir } {
     lassign [ls_host $cache_dir] ret files_before
+    puts "before: '$files_before'"
+    exit
...
we have:
...
files_before: ''
...

When further adding:
...
 proc_with_prefix test_cache_disabled { cache_dir } {
+    exec touch $cache_dir/foo.1 $cache_dir/foo.2 $cache_dir/foo.3
...
we have:
...
files_before: 'foo.1'
...
while we're expecting file_before to contain foo.[123].

Fix this by making the return statement in ls_host return a list rather than a
string (in accordance with the ls_host documentation), after which we have:
...
files_before: 'foo.1 foo.2 foo.3'
...

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-05-07  Tom de Vries  <tdevries@suse.de>

	* gdb.base/index-cache.exp (ls_host): Fix return statement.

2 files changed, 5 insertions, 1 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 0af0d37..9610579 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,9 @@
 2019-05-07  Tom de Vries  <tdevries@suse.de>
 
+	* gdb.base/index-cache.exp (ls_host): Fix return statement.
+
+2019-05-07  Tom de Vries  <tdevries@suse.de>
+
 	PR testsuite/24522
 	* gdb.dlang/watch-loc.c: Fix debug_info_offset in .debug_aranges
 	section.
diff --git a/gdb/testsuite/gdb.base/index-cache.exp b/gdb/testsuite/gdb.base/index-cache.exp
index 5baba84..b76a02b 100644
--- a/gdb/testsuite/gdb.base/index-cache.exp
+++ b/gdb/testsuite/gdb.base/index-cache.exp
@@ -50,7 +50,7 @@ proc ls_host { dir } {
 	}
     }
 
-    return "0 $filtered"
+    return [list 0 $filtered]
 }
 
 # Execute "show index-cache stats" and verify the output against expected