x86/fpu: Remove duplicate copy_fpstate_to_sigframe() prototype

The function prototype of copy_fpstate_to_sigframe() is declared twice in

  0ae67cc3 ("x86/fpu: Remove internal.h dependency from fpu/signal.h").

Remove one of them.

 [ bp: Massage ]
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211209015550.51916-1-zhangshaokun@hisilicon.com

arch/x86/include/asm/fpu/signal.h

@@ -41,7 +41,4 @@ extern void fpu__clear_user_states(struct fpu *fpu);
 extern bool fpu__restore_sig(void __user *buf, int ia32_frame);
 
 extern void restore_fpregs_from_fpstate(struct fpstate *fpstate, u64 mask);
-
-extern bool copy_fpstate_to_sigframe(void __user *buf, void __user *fp, int size);
-
 #endif /* _ASM_X86_FPU_SIGNAL_H */