bricks/_common/micropython.c: Handle unaligned module size

Because the storage layer rounds up code size to a multiple of
the word size, it is possible for the set of code modules to have
trailing padding. Previously, this could cause the module search
function to not terminate as expected, read out of bounds, and crash.

Author: ArcaneNibble

bricks/_common/micropython.c

@@ -240,7 +240,7 @@ static uint8_t *mpy_data_get_buf(mpy_info_t *info) {
 static mpy_info_t *mpy_data_find(qstr name) {
     const char *name_str = qstr_str(name);
 
-    for (mpy_info_t *info = mpy_first; info < mpy_end;
+    for (mpy_info_t *info = mpy_first; (uintptr_t)info + sizeof(uint32_t) < (uintptr_t)mpy_end;
          info = (mpy_info_t *)(mpy_data_get_buf(info) + pbio_get_uint32_le(info->mpy_size))) {
         if (strcmp(info->mpy_name, name_str) == 0) {
             return info;