kprobes/arm: fix decoding of arithmetic immediate instructions

The ARM kprobes arithmetic immediate instruction decoder
(space_cccc_001x()) was accidentally zero'ing out not only the Rn and
Rd arguments, but the lower nibble of the immediate argument as well
-- this patch fixes this.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Nicolas Pitre <nico@marvell.com>

arch/arm/kernel/kprobes-decode.c

@@ -1176,7 +1176,7 @@ space_cccc_001x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
 	 * *S (bit 20) updates condition codes
 	 * ADC/SBC/RSC reads the C flag
 	 */
-	insn &= 0xfff00ff0;	/* Rn = r0, Rd = r0 */
+	insn &= 0xfff00fff;	/* Rn = r0, Rd = r0 */
 	asi->insn[0] = insn;
 	asi->insn_handler = (insn & (1 << 20)) ?  /* S-bit */
 			emulate_alu_imm_rwflags : emulate_alu_imm_rflags;