RISCV/GAS Add missing break in md_apply_fix.

gdb/ChangeLog:
	* config/tc-riscv.c: Add missing break.

gas/ChangeLog

@@ -1,3 +1,7 @@
+2016-11-23  Kuan-Lin Chen  <kuanlinchentw@gmail.com>
+
+	* config/tc-riscv.c: Add missing break.
+
 2016-11-23  Alan Modra  <amodra@gmail.com>
 
 	* po/POTFILES.in: Regenerate.

gas/config/tc-riscv.c

@@ -1892,6 +1892,7 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
 	    case BFD_RELOC_8:
 	      fixP->fx_r_type = BFD_RELOC_RISCV_ADD8;
 	      fixP->fx_next->fx_r_type = BFD_RELOC_RISCV_SUB8;
+	      break;
 
 	    default:
 	      /* This case is unreachable.  */