cacheinfo: Remove unused check in init_cache_level()

commit e75d18cecbb3 ("arm64: cacheinfo: Fix incorrect assignment
of signed error value to unsigned fw_level")
checks the fw_level value in init_cache_level() in case the value is
negative.
Remove this check as the error code is not returned through
fw_level anymore, and reset fw_level if acpi_get_cache_info()
failed. This allows to try fetching the cache information from
clidr_el1.

Signed-off-by: Pierre Gondois <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

arch/arm64/kernel/cacheinfo.c

···
 			fw_level = 0;
 	}
 
-	if (fw_level < 0)
-		return fw_level;
-
 	if (level < fw_level) {
 		/*
 		 * some external caches not specified in CLIDR_EL1