tests/hmp: Fix typo in the 'chardev-send-break' test

testchardev2 is not a valid chardev id here. Use testchardev1
instead which has been created with chardev-add right before
the 'chardev-send-break' line.
And while we're at it, add the test-hmp.c file to the MAINTAINERS
file, too.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: 1501149097-19071-1-git-send-email-thuth@redhat.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

MAINTAINERS

@@ -1346,6 +1346,7 @@ F: monitor.c
 F: hmp.[ch]
 F: hmp-commands*.hx
 F: include/monitor/hmp-target.h
+F: tests/test-hmp.c
 
 Network device backends
 M: Jason Wang <jasowang@redhat.com>

tests/test-hmp.c

@@ -22,7 +22,7 @@ static int verbose;
 static const char *hmp_cmds[] = {
     "boot_set ndc",
     "chardev-add null,id=testchardev1",
-    "chardev-send-break testchardev2",
+    "chardev-send-break testchardev1",
     "chardev-change testchardev1 ringbuf",
     "chardev-remove testchardev1",
     "commit all",