skia2/tests/sksl/errors/Ossfuzz38560.glsl

### Compilation failed:

error: 1: symbol 'r' was already defined
error: 1: variable 's' must be created in a scope
2 errors
Fix for-statement assertion detected by the fuzzer. The fuzzer found that the `DetectVarDeclarationWithoutScope` check was placed too late in the function, and could be skipped over by for-loops containing multiple variables. This was caught in ForStatement::Make, which mirrors the Convert postconditions with matching assertions. Change-Id: I6e9d97c7c9ca969aba65e601bbcd9fe676105838 Bug: oss-fuzz:38560 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/448116 Commit-Queue: John Stiles <johnstiles@google.com> Commit-Queue: Brian Osman <brianosman@google.com> Auto-Submit: John Stiles <johnstiles@google.com> Reviewed-by: Brian Osman <brianosman@google.com> 2021-09-13 12:55:40 +00:00			`### Compilation failed:`

			`error: 1: symbol 'r' was already defined`
			`error: 1: variable 's' must be created in a scope`
			`2 errors`