opensmtpd: fix missing braces in proc_path.diff (#508031)

 	char		 exec[_POSIX_ARG_MAX];

 	int		 execr;

@@ -1455,8 +1462,12 @@ fork_filter_process(const char *name, const char *command, const char *user, con

 	if (command[0] == '/')

 		execr = snprintf(exec, sizeof(exec), "exec %s", command);

 	else

@@ -1455,7 +1462,12 @@ fork_filter_process(const char *name, const char *command, const char *user, con

-	if (command[0] == '/')

-		execr = snprintf(exec, sizeof(exec), "exec %s", command);

-	else

-		execr = snprintf(exec, sizeof(exec), "exec %s/%s", 

-		    PATH_LIBEXEC, command);

+	if (command[0] == '/') {

+		execr = snprintf(exec, sizeof(exec), "exec %s", command);

+	} else {

+		proc_path = getenv("OPENSMTPD_PROC_PATH");

+		if (proc_path == NULL) {

+			proc_path = PATH_LIBEXEC;

+		}

 		execr = snprintf(exec, sizeof(exec), "exec %s/%s", 

-		    PATH_LIBEXEC, command);

+		execr = snprintf(exec, sizeof(exec), "exec %s/%s",

+		    proc_path, command);

+	}

 	if (execr >= (int) sizeof(exec))

 		fatalx("%s: exec path too long", name);