arm64: xor-neon: mark xor_arm64_neon_*() static

The only references to these functions are in the same file, and
there is no prototype, which causes a harmless warning:

arch/arm64/lib/xor-neon.c:13:6: error: no previous prototype for 'xor_arm64_neon_2' [-Werror=missing-prototypes]
arch/arm64/lib/xor-neon.c:40:6: error: no previous prototype for 'xor_arm64_neon_3' [-Werror=missing-prototypes]
arch/arm64/lib/xor-neon.c:76:6: error: no previous prototype for 'xor_arm64_neon_4' [-Werror=missing-prototypes]
arch/arm64/lib/xor-neon.c:121:6: error: no previous prototype for 'xor_arm64_neon_5' [-Werror=missing-prototypes]

Fixes: cc9f834 ("arm64: crypto: add NEON accelerated XOR implementation")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20230516160642.523862-2-arnd@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Author: arndb

arch/arm64/lib/xor-neon.c

@@ -10,7 +10,7 @@
 #include <linux/module.h>
 #include <asm/neon-intrinsics.h>
 
-void xor_arm64_neon_2(unsigned long bytes, unsigned long * __restrict p1,
+static void xor_arm64_neon_2(unsigned long bytes, unsigned long * __restrict p1,
 	const unsigned long * __restrict p2)
 {
 	uint64_t *dp1 = (uint64_t *)p1;
@@ -37,7 +37,7 @@ void xor_arm64_neon_2(unsigned long bytes, unsigned long * __restrict p1,
 	} while (--lines > 0);
 }
 
-void xor_arm64_neon_3(unsigned long bytes, unsigned long * __restrict p1,
+static void xor_arm64_neon_3(unsigned long bytes, unsigned long * __restrict p1,
 	const unsigned long * __restrict p2,
 	const unsigned long * __restrict p3)
 {
@@ -73,7 +73,7 @@ void xor_arm64_neon_3(unsigned long bytes, unsigned long * __restrict p1,
 	} while (--lines > 0);
 }
 
-void xor_arm64_neon_4(unsigned long bytes, unsigned long * __restrict p1,
+static void xor_arm64_neon_4(unsigned long bytes, unsigned long * __restrict p1,
 	const unsigned long * __restrict p2,
 	const unsigned long * __restrict p3,
 	const unsigned long * __restrict p4)
@@ -118,7 +118,7 @@ void xor_arm64_neon_4(unsigned long bytes, unsigned long * __restrict p1,
 	} while (--lines > 0);
 }
 
-void xor_arm64_neon_5(unsigned long bytes, unsigned long * __restrict p1,
+static void xor_arm64_neon_5(unsigned long bytes, unsigned long * __restrict p1,
 	const unsigned long * __restrict p2,
 	const unsigned long * __restrict p3,
 	const unsigned long * __restrict p4,