LoongArch: Fix SYM_SIGFUNC_START definition for 32BIT

commit 98b8aeb upstream.

The SYM_SIGFUNC_START definition should match sigcontext that the length
of GPRs are 8 bytes for both 32BIT and 64BIT. So replace SZREG with 8 to
fix it.

Cc: stable@vger.kernel.org
Fixes: e4878c3 ("LoongArch: vDSO: Emit GNU_EH_FRAME correctly")
Suggested-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: chenhuacai

arch/loongarch/include/asm/linkage.h

@@ -69,7 +69,7 @@
 		  9,  10, 11, 12, 13, 14, 15, 16,	\
 		  17, 18, 19, 20, 21, 22, 23, 24,	\
 		  25, 26, 27, 28, 29, 30, 31;		\
-	.cfi_offset \num, SC_REGS + \num * SZREG;	\
+	.cfi_offset \num, SC_REGS + \num * 8;		\
 	.endr;						\
 							\
 	nop;						\