ARM: sharpsl_param: work around -Wstringop-overread warning

gcc warns that accessing a pointer based on a numeric constant may
be an offset into a NULL pointer, and would therefore has zero
accessible bytes:

arch/arm/common/sharpsl_param.c: In function ‘sharpsl_save_param’:
arch/arm/common/sharpsl_param.c:43:9: error: ‘memcpy’ reading 64 bytes from a region of size 0 [-Werror=stringop-overread]
   43 |         memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info));
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In this particular case, the warning is bogus since this is the actual
pointer, not an offset on a NULL pointer. Add a local variable to shut
up the warning and hope it doesn't come back.

Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Daniel Mack <[email protected]>
Cc: Daniel Mack <[email protected]>
Cc: Haojian Zhuang <[email protected]>
Cc: Robert Jarzmik <[email protected]>
Cc: Russell King <[email protected]>
Cc: Linus Walleij <[email protected]>
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578
Link: https://lore.kernel.org/r/[email protected]'
Signed-off-by: Arnd Bergmann <[email protected]>

Author: arndb

arch/arm/common/sharpsl_param.c

@@ -40,7 +40,9 @@ EXPORT_SYMBOL(sharpsl_param);
 
 void sharpsl_save_param(void)
 {
-	memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info));
+	struct sharpsl_param_info *params = param_start(PARAM_BASE);
+
+	memcpy(&sharpsl_param, params, sizeof(*params));
 
 	if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
 		sharpsl_param.comadj=-1;