score: cleanups: dead code, 0 as pointer, shadowed variables

A few smaller issues found by sparse, some code that was
never used, two instances of '0' instead of 'NULL' and
local variables shadowing another one.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/score/kernel/module.c

@@ -57,17 +57,17 @@ int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
 	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
 		unsigned long loc;
 		Elf32_Sym *sym;
-		s32 offset;
+		s32 r_offset;
 
-		offset = ELF32_R_SYM(rel->r_info);
-		if ((offset < 0) ||
-		    (offset > (symsec->sh_size / sizeof(Elf32_Sym)))) {
+		r_offset = ELF32_R_SYM(rel->r_info);
+		if ((r_offset < 0) ||
+		    (r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) {
 			printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
 				me->name, relindex, i);
 				return -ENOEXEC;
 		}
 
-		sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
+		sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset;
 
 		if ((rel->r_offset < 0) ||
 		    (rel->r_offset > dstsec->sh_size - sizeof(u32))) {
@@ -152,7 +152,7 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
 /* Given an address, look for it in the module exception tables. */
 const struct exception_table_entry *search_module_dbetables(unsigned long addr)
 {
-	return 0;
+	return NULL;
 }
 
 /* Put in dbe list if necessary. */

arch/score/kernel/signal.c

@@ -212,7 +212,7 @@ static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 
 	err |= copy_siginfo_to_user(&frame->rs_info, info);
 	err |= __put_user(0, &frame->rs_uc.uc_flags);
-	err |= __put_user(0, &frame->rs_uc.uc_link);
+	err |= __put_user(NULL, &frame->rs_uc.uc_link);
 	err |= __put_user((void __user *)current->sas_ss_sp,
 				&frame->rs_uc.uc_stack.ss_sp);
 	err |= __put_user(sas_ss_flags(regs->regs[0]),

arch/score/kernel/sys_score.c

@@ -31,10 +31,7 @@
 #include <linux/syscalls.h>
 #include <asm/syscalls.h>
 
-unsigned long shm_align_mask = PAGE_SIZE - 1;
-EXPORT_SYMBOL(shm_align_mask);
-
-asmlinkage unsigned
+asmlinkage long 
 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 	  unsigned long flags, unsigned long fd, unsigned long pgoff)
 {
@@ -106,15 +103,6 @@ score_execve(struct pt_regs *regs)
 	return error;
 }
 
-/*
- * If we ever come here the user sp is bad.  Zap the process right away.
- * Due to the bad stack signaling wouldn't work.
- */
-void bad_stack(void)
-{
-	do_exit(SIGSEGV);
-}
-
 /*
  * Do a system call from kernel instead of calling sys_execve so we
  * end up with proper pt_regs.