riscv: drop cpufeature_apply_feature tracking variable

The variable was tracking which feature patches got applied
but that information was never actually used - and thus resulted
in a warning as well.

Drop the variable.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20220526205646.258337-2-heiko@sntech.de
Fixes: ff689fd21c ("riscv: add RISC-V Svpbmt extension support")
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/kernel/cpufeature.c

@@ -293,7 +293,6 @@ void __init_or_module riscv_cpufeature_patch_func(struct alt_entry *begin,
 						  unsigned int stage)
 {
 	u32 cpu_req_feature = cpufeature_probe(stage);
-	u32 cpu_apply_feature = 0;
 	struct alt_entry *alt;
 	u32 tmp;
 
@@ -307,10 +306,8 @@ void __init_or_module riscv_cpufeature_patch_func(struct alt_entry *begin,
 		}
 
 		tmp = (1U << alt->errata_id);
-		if (cpu_req_feature & tmp) {
+		if (cpu_req_feature & tmp)
 			patch_text_nosync(alt->old_ptr, alt->alt_ptr, alt->alt_len);
-			cpu_apply_feature |= tmp;
-		}
 	}
 }
 #endif