binfmt_elf warning fix

fs/binfmt_elf.c: In function 'load_elf_binary':
fs/binfmt_elf.c:1002: warning: 'interp_map_addr' may be used uninitialized in this function

The compiler (gcc-4.1.0) is correct, but it failed to notice that we didn't
use the resulting value.
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/binfmt_elf.c

@@ -999,7 +999,7 @@ static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
 			elf_entry = load_aout_interp(&loc->interp_ex,
 						     interpreter);
 		} else {
-			unsigned long interp_map_addr;	/* unused */
+			unsigned long uninitialized_var(interp_map_addr);
 
 			elf_entry = load_elf_interp(&loc->interp_elf_ex,
 						    interpreter,