Address warning:

bbslist.c: In function 'get_emulation_str':
bbslist.c:2105:1: warning: control reaches end of non-void function

src/syncterm/bbslist.c

@@ -2102,6 +2102,7 @@ get_emulation_str(cterm_emulation_t emu)
 		case CTERM_EMULATION_ATASCII:
 			return "ATASCII";
 	}
+	return "none";
 }
 
 void