[PATCH] put_user() warning fix

Patch from Russell King <rmk@arm.linux.org.uk>

Have a couple of extra warnings:

fs/binfmt_elf.c: In function `create_elf_tables':
fs/binfmt_elf.c:239: warning: initialization makes integer from pointer without a cast
fs/binfmt_elf.c:249: warning: initialization makes integer from pointer without a cast

#ifndef elf_addr_t
#define elf_addr_t unsigned long
#endif

        elf_addr_t *argv, *envp;

        __put_user(NULL, argv);
        __put_user(NULL, envp);

It would therefore appear that x86 __put_user is not properly type-checking
the arguments to __put_user().

Here's a patch which fixes the warning (but doesn't fix x86's type-check
challenged __put_user implementation).

fs/binfmt_elf.c

@@ -236,7 +236,7 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
 			return;
 		p += len;
 	}
-	__put_user(NULL, argv);
+	__put_user(0, argv);
 	current->mm->arg_end = current->mm->env_start = p;
 	while (envc-- > 0) {
 		size_t len;
@@ -246,7 +246,7 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
 			return;
 		p += len;
 	}
-	__put_user(NULL, envp);
+	__put_user(0, envp);
 	current->mm->env_end = p;
 
 	/* Put the elf_info on the stack in the right place.  */