[RISCV] Use common code for R_RISCV_CHERI_CAPABILITY in getRelocType

Currently it's a one-liner but more code will be added here, so avoid
needing to duplicate it.

Author: jrtc27

llvm/lib/Target/RISCV/MCTargetDesc/RISCVELFObjectWriter.cpp

@@ -156,14 +156,16 @@ unsigned RISCVELFObjectWriter::getRelocType(const MCFixup &Fixup,
           "8-byte capability relocations not supported on RV64");
       return ELF::R_RISCV_NONE;
     }
-    return ELF::R_RISCV_CHERI_CAPABILITY;
+    goto CheriCapability;
   case FK_Cap_16:
     if (!is64Bit()) {
       getContext().reportError(
           Fixup.getLoc(),
           "16-byte capability relocations not supported on RV32");
       return ELF::R_RISCV_NONE;
     }
+    goto CheriCapability;
+  CheriCapability:
     return ELF::R_RISCV_CHERI_CAPABILITY;
   case RISCV::fixup_riscv_cheriot_compartment_hi:
     return ELF::R_RISCV_CHERIOT_COMPARTMENT_HI;