Avoid using exiting allocators in the front end.

src/sesh.c

@@ -41,7 +41,6 @@
 #include "sudo_gettext.h"	/* must be included before sudo_compat.h */
 
 #include "sudo_compat.h"
-#include "sudo_alloc.h"
 #include "sudo_fatal.h"
 #include "sudo_conf.h"
 #include "sudo_debug.h"
@@ -98,7 +97,8 @@ main(int argc, char *argv[], char *envp[])
 	/* Shift argv and make a copy of the command to execute. */
 	argv++;
 	argc--;
-	cmnd = sudo_estrdup(argv[0]);
+	if ((cmnd = strdup(argv[0])) == NULL)
+	    sudo_fatalx(U_("unable to allocate memory"));
 
 	/* If invoked as a login shell, modify argv[0] accordingly. */
 	if (login_shell) {