parisc: fix braino in commit adding __space_to_prot

Shouldn't commit without building before morning coffee...
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

arch/parisc/include/asm/mmu_context.h

@@ -34,7 +34,7 @@ destroy_context(struct mm_struct *mm)
 	mm->context = 0;
 }
 
-static inline unsigned long __space_to_prot(mm_context_t ctx)
+static inline unsigned long __space_to_prot(mm_context_t context)
 {
 #if SPACEID_SHIFT == 0
 	return context << 1;