hush: "adopt" ash signal4.tests

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/hush.c

@@ -9486,7 +9486,7 @@ static int FAST_FUNC builtin_trap(char **argv)
 			if (sig < 0 || sig >= NSIG) {
 				ret = EXIT_FAILURE;
 				/* Mimic bash message exactly */
-				bb_perror_msg("trap: %s: invalid signal specification", argv[-1]);
+				bb_error_msg("trap: %s: invalid signal specification", argv[-1]);
 				continue;
 			}
 

shell/hush_test/hush-signals/signal4.right

@@ -0,0 +1,4 @@
+hush: trap: BADNAME: invalid signal specification
+1
+Trapped
+Ok

shell/hush_test/hush-signals/signal4.tests

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+trap "echo Trapped" BADNAME TERM; echo $?
+kill $$
+echo Ok