block: fix rustc migration error

kernel/libk/src/device/block/cache.rs

@@ -59,7 +59,8 @@ impl DeviceMapper {
         if !block_size.is_multiple_of(device.block_size()) {
             log::error!(
                 "Couldn't create block mapper for {filesystem}: \
-                 cache block size is not a multiple of device block size"
+                 cache block size ({block_size}) is not a multiple of device block size ({})",
+                device.block_size()
             );
             return Err(Error::InvalidArgument);
         }
@@ -171,10 +172,11 @@ impl BlockCache {
         bucket_count: usize,
         filesystem: &str,
     ) -> Result<Self, Error> {
-        if block_size.is_multiple_of(device.block_size()) {
+        if !block_size.is_multiple_of(device.block_size()) {
             log::error!(
                 "Couldn't create block cache for {filesystem}: \
-                cache block size is not a multiple of device block size"
+                cache block size ({block_size}) is not a multiple of device block size ({})",
+                device.block_size()
             );
             return Err(Error::InvalidArgument);
         }