riscv: Make regs_irqs_disabled() more clear

The return value of regs_irqs_disabled() is true or false, so change
its type to reflect that and also make it always inline.

Suggested-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20250422113156.25742-1-yangtiezhu@loongson.cn
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>

Author: seehearfeel

arch/riscv/include/asm/ptrace.h

@@ -175,7 +175,7 @@ static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs,
 	return 0;
 }
 
-static inline int regs_irqs_disabled(struct pt_regs *regs)
+static __always_inline bool regs_irqs_disabled(struct pt_regs *regs)
 {
 	return !(regs->status & SR_PIE);
 }