[PATCH] hush: fix last_return_code when PROMPT_COMMAND is used

[Sascha Hauer <s.hauer@pengutronix.de>]

Wenn PROMPT_COMMAND is used then a "echo $?" shows the result of the
PROMPT_COMMAND instead of the result of the last command. Fix this by
restoring the previous value after PROMPT_COMMAND has been executed.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 common/hush.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/common/hush.c b/common/hush.c
index 8515e77338..ec3c0cd913 100644
--- a/common/hush.c
+++ b/common/hush.c
@@ -433,9 +433,13 @@ static char *getprompt(void)
 
 	prompt_command = getenv("PROMPT_COMMAND");
 	if (prompt_command) {
+		unsigned int lr = last_return_code;
+
 		initialize_context(&ctx);
 		parse_string_outer(&ctx, prompt_command, FLAG_PARSE_SEMICOLON);
 		release_context(&ctx);
+
+		last_return_code = lr;
 	}
 
 	ps1 = getenv("PS1");
-- 
2.47.3