email_lib: encode LF-only newlines for vcard

References: GXH-120

Author: jengelh

lib/email/vcard.cpp

@@ -400,7 +400,7 @@ static size_t vcard_serialize_string(char *pbuff,
 			pbuff[offset++] = '\\';
 			if (line_offset >= 0)
 				line_offset ++;
-		} else if ('\r' == string[i] && '\n' == string[i + 1]) {
+		} else if ((string[i] == '\r' && string[i+1] == '\n') || string[i] == '\n') {
 			if (offset + 1 >= max_length)
 				return max_length;
 			pbuff[offset++] = '\\';