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

Update commit 1ac944007bed ("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 <[e-mail]>
Cc: James Hogan <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/16401/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/math-emu/cp1emu.c

···
 
 		case mfhc_op:
 			if (!cpu_has_mips_r2_r6)
-				goto sigill;
+				return SIGILL;
 
 			/* copregister rd -> gpr[rt] */
 			if (MIPSInst_RT(ir) != 0) {
···
 
 		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));
···
 				xcp->regs[MIPSInst_RS(ir)];
 		break;
 	default:
-sigill:
 		return SIGILL;
 	}