MIPS: math-emu: For MFHC1/MTHC1 also return SIGILL right away

Update commit 1ac94400 ("MIPS: math-emu: Add mfhc1 & mthc1
support.") and like done throughout `cop1Emulate' for other cases also
for the MFHC1 and MTHC1 instructions return SIGILL right away rather
than jumping to a single `return' statement.
Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16401/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/math-emu/cp1emu.c

@@ -1142,7 +1142,7 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
 
 		case mfhc_op:
 			if (!cpu_has_mips_r2_r6)
-				goto sigill;
+				return SIGILL;
 
 			/* copregister rd -> gpr[rt] */
 			if (MIPSInst_RT(ir) != 0) {
@@ -1153,7 +1153,7 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
 
 		case mthc_op:
 			if (!cpu_has_mips_r2_r6)
-				goto sigill;
+				return SIGILL;
 
 			/* copregister rd <- gpr[rt] */
 			SITOHREG(xcp->regs[MIPSInst_RT(ir)], MIPSInst_RD(ir));
@@ -1376,7 +1376,6 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
 				xcp->regs[MIPSInst_RS(ir)];
 		break;
 	default:
-sigill:
 		return SIGILL;
 	}