arm64: signal: Fix some under-bracketed UAPI macros

A few SME-related sigcontext UAPI macros leave an argument
unprotected from misparsing during macro expansion.

Add parentheses around references to macro arguments where
appropriate.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Fixes: ee072cf7 ("arm64/sme: Implement signal handling for ZT")
Fixes: 39782210 ("arm64/sme: Implement ZA signal handling")
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240729152005.289844-1-Dave.Martin@arm.comSigned-off-by: Will Deacon <will@kernel.org>

arch/arm64/include/uapi/asm/sigcontext.h

@@ -320,10 +320,10 @@ struct zt_context {
 	((sizeof(struct za_context) + (__SVE_VQ_BYTES - 1))	\
 		/ __SVE_VQ_BYTES * __SVE_VQ_BYTES)
 
-#define ZA_SIG_REGS_SIZE(vq) ((vq * __SVE_VQ_BYTES) * (vq * __SVE_VQ_BYTES))
+#define ZA_SIG_REGS_SIZE(vq) (((vq) * __SVE_VQ_BYTES) * ((vq) * __SVE_VQ_BYTES))
 
 #define ZA_SIG_ZAV_OFFSET(vq, n) (ZA_SIG_REGS_OFFSET + \
-				  (SVE_SIG_ZREG_SIZE(vq) * n))
+				  (SVE_SIG_ZREG_SIZE(vq) * (n)))
 
 #define ZA_SIG_CONTEXT_SIZE(vq) \
 		(ZA_SIG_REGS_OFFSET + ZA_SIG_REGS_SIZE(vq))
@@ -334,7 +334,7 @@ struct zt_context {
 
 #define ZT_SIG_REGS_OFFSET sizeof(struct zt_context)
 
-#define ZT_SIG_REGS_SIZE(n) (ZT_SIG_REG_BYTES * n)
+#define ZT_SIG_REGS_SIZE(n) (ZT_SIG_REG_BYTES * (n))
 
 #define ZT_SIG_CONTEXT_SIZE(n) \
 	(sizeof(struct zt_context) + ZT_SIG_REGS_SIZE(n))