target-arm: Fix missing 'return' in SRS handling.

There's a return missing in the srs handling which leads to srs always being
treated an an invalid op.
Signed-off-by: NAdam Lackorzynski <adam@os.inf.tu-dresden.de>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

target-arm/translate.c

@@ -6131,6 +6131,7 @@ static void disas_arm_insn(CPUState * env, DisasContext *s)
             } else {
                 dead_tmp(addr);
             }
+            return;
         } else if ((insn & 0x0e5fffe0) == 0x081d0a00) {
             /* rfe */
             int32_t offset;