[PATCH] common/command.c: Avoid NULL pointer use in cmd_auto_complete

[Adam Lackorzynski]

Avoid putting a potential NULL pointer to strcmp, which would lead to a
load at address 0.

Signed-off-by: Adam Lackorzynski <adam at l4re.org>
---
 common/command.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/command.c b/common/command.c
index 0f9dd06d72b..55bd9e44b1f 100644
--- a/common/command.c
+++ b/common/command.c
@@ -373,7 +373,7 @@ int cmd_auto_complete(const char *const prompt, char *buf, int *np, int *colp)
 	const char *ps_prompt = CONFIG_SYS_PROMPT;
 #endif
 
-	if (strcmp(prompt, ps_prompt) != 0)
+	if (ps_prompt && strcmp(prompt, ps_prompt) != 0)
 		return 0;	/* not in normal console */
 
 	cnt = strlen(buf);
-- 
2.53.0