Missing parentheses in macros can lead to unintended behavior

[vomindoraan]

https://github.com/tmk/tmk_keyboard/blob/master/tmk_core/common/progmem.h#L8-L9

The arguments, p, should be parenthesized. Otherwise, calling pgm_read_word(ptr + i) might result in the wrong address being calculated due to ptr being type cast before addition. Other macros in the codebase might have the same issue.

Solution: put p in parentheses.

#   define pgm_read_byte(p)     *((unsigned char*)(p))
#   define pgm_read_word(p)     *((uint16_t*)(p))

Discovered in qmk/qmk_firmware#4775.