Check for NULL prompt in readline_into_buffer()

Previously, passing readline() or readline_into_buffer() a NULL 'prompt'
parameter would result in puts() printing garbage when
CONFIG_CMDLINE_EDITING was enabled.

Note that no board currently triggers this bug.  Enabling
CONFIG_CMDLINE_EDITING on some boards (eg bab7xx) would result in
the bug appearing.  This change is only intended to prevent someone
from running into this issue in the future.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

common/main.c

@@ -964,6 +964,7 @@ int readline_into_buffer (const char *const prompt, char * buffer)
 			initted = 1;
 		}
 
+		if (prompt)
 			puts (prompt);
 
 		rc = cread_line(prompt, p, &len);