[PATCH] Fix warning in memrchr.c

[Federico Terraneo]

Hi,
the following patch fixes the warning reproted below, introduced by our 
previous patch.

Best regards,
Federico Terraneo


../../../newlib-4.6.0.20260123/newlib/libc/string/memrchr.c:50:26: 
warning: suggest parentheses around '+' in operand of '&' [-Wparentheses]
    50 |   while (UNALIGNED_X(src + 1))
../../../newlib-4.6.0.20260123/newlib/libc/string/local.h:24:31: note: 
in definition of macro 'UNALIGNED_X'
    24 | #define UNALIGNED_X(X) ((long)X & (sizeof (long) - 1))
       |                               ^
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