[Mesa-dev] [PATCH] fix unused variable warnings

[Fabio Pedretti]

The attached patch fixes the following swrast warnings:

swrast/s_span.c: In function 'interpolate_int_colors':
swrast/s_span.c:216:11: warning: unused variable 'i'
swrast/s_span.c:215:17: warning: unused variable 'n'
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