x86: i387.c declare dump_fpu() before they get used

Signed-off-by: Jaswinder Singh <jaswinder@infradead.org>

include/asm-x86/i387.h

@@ -24,6 +24,7 @@ extern void mxcsr_feature_mask_init(void);
 extern int init_fpu(struct task_struct *child);
 extern asmlinkage void math_state_restore(void);
 extern void init_thread_xstate(void);
+extern int dump_fpu(struct pt_regs *, struct user_i387_struct *);
 
 extern user_regset_active_fn fpregs_active, xfpregs_active;
 extern user_regset_get_fn fpregs_get, xfpregs_get, fpregs_soft_get;