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ad593c286f
Failed to build `tile_example_fmha_bwd` due to below error
```
/home/rahjain/src/composable_kernel/example/ck_tile/01_fmha/fmha_bwd.cpp:358:30: error: comparison of integers of different signs: 'size_type' (aka 'unsigned long') and 'ck_tile::index_t' (aka 'int') [-Werror,-Wsign-compare]
358 | assert(slopes.size() == nhead);
| ~~~~~~~~~~~~~ ^ ~~~~~
/usr/include/assert.h:103:27: note: expanded from macro 'assert'
103 | (static_cast <bool> (expr) \
| ^~~~
/home/rahjain/src/composable_kernel/example/ck_tile/01_fmha/fmha_bwd.cpp:989:16: note: in instantiation of function template specialization 'run<FmhaBwdFp16>' requested here
989 | return run<FmhaBwdFp16>(arg_parser) ? 0 : -2;
| ^
/home/rahjain/src/composable_kernel/example/ck_tile/01_fmha/fmha_bwd.cpp:358:30: error: comparison of integers of different signs: 'size_type' (aka 'unsigned long') and 'ck_tile::index_t' (aka 'int') [-Werror,-Wsign-compare]
358 | assert(slopes.size() == nhead);
| ~~~~~~~~~~~~~ ^ ~~~~~
/usr/include/assert.h:103:27: note: expanded from macro 'assert'
103 | (static_cast <bool> (expr) \
| ^~~~
/home/rahjain/src/composable_kernel/example/ck_tile/01_fmha/fmha_bwd.cpp:993:16: note: in instantiation of function template specialization 'run<FmhaBwdBf16>' requested here
993 | return run<FmhaBwdBf16>(arg_parser) ? 0 : -2;
| ^
2 errors generated when compiling for gfx942.
```
Fixed with proper cast