Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: trufae

libr/core/cmd.c

@@ -4431,7 +4431,7 @@ static void unescape_shell_control_operators(char *cmd) {
 				continue;
 			}
 			if (!quote && (src[1] == '&' || src[1] == '|') &&
-					src[2] == '\\' && src[3] == src[1]) {
+					src[2] && src[3] && src[2] == '\\' && src[3] == src[1]) {
 				*dst++ = src[1];
 				*dst++ = src[1];
 				src += 4;