PATCH m68knommu clear frame-pointer in start_thread

["Philippe De Muyter" <phdm@macqel.be>]

When trying to print the calltrace of a user process on m68knommu targets
gdb follows the frame-pointer en falls on unreachable adresses, because
the frame pointer is not properly initialised by start_thread. This patch
initialises the frame pointer to NULL in start_thread.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>

---

the only change is the initialisztion of a6, the rest is spacing fixes

Index: linux-2.6.x/include/asm-m68knommu/processor.h
===================================================================
RCS file: /newdev6/cvsrepos/uClinux-dist/linux-2.6.x/include/asm-m68knommu/processor.h,v
retrieving revision 1.1.1.1
diff -r1.1.1.1 processor.h
92,99c92,100
< #define start_thread(_regs, _pc, _usp)           \
< do {                                             \
< 	set_fs(USER_DS); /* reads from user space */ \
< 	(_regs)->pc = (_pc);                         \
< 	if (current->mm)                             \
< 		(_regs)->d5 = current->mm->start_data;   \
< 	(_regs)->sr &= ~0x2000;                      \
< 	wrusp(_usp);                                 \
---
> #define start_thread(_regs, _pc, _usp)			\
> do {							\
> 	set_fs(USER_DS); /* reads from user space */	\
> 	(_regs)->pc = (_pc);				\
> 	((struct switch_stack *)(_regs))[-1].a6 = 0;	\
> 	if (current->mm)				\
> 		(_regs)->d5 = current->mm->start_data;	\
> 	(_regs)->sr &= ~0x2000;				\
> 	wrusp(_usp);					\
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