Don't print 0x for core_addr_to_string_nz

core_addr_to_string_nz returns string which has "0x" prefix, so don't
need to print "0x" again.  This patch is to remove the "0x".

gdb:

2016-02-15  Yao Qi  <yao.qi@linaro.org>

	* aarch64-tdep.c (aarch64_analyze_prologue): Remove "0x".

gdb/ChangeLog

@@ -1,3 +1,7 @@
+2016-02-15  Yao Qi  <yao.qi@linaro.org>
+
+	* aarch64-tdep.c (aarch64_analyze_prologue): Remove "0x".
+
 2016-02-12  Yao Qi  <yao.qi@linaro.org>
 
 	* arch/arm-linux.c (arm_linux_get_next_pcs_fixup): Calculate

gdb/aarch64-tdep.c

@@ -299,7 +299,7 @@ aarch64_analyze_prologue (struct gdbarch *gdbarch,
 	      if (aarch64_debug)
 		{
 		  debug_printf ("aarch64: prologue analysis gave up "
-				"addr=0x%s opcode=0x%x (orr x register)\n",
+				"addr=%s opcode=0x%x (orr x register)\n",
 				core_addr_to_string_nz (start), insn);
 		}
 	      break;
@@ -365,7 +365,7 @@ aarch64_analyze_prologue (struct gdbarch *gdbarch,
 	{
 	  if (aarch64_debug)
 	    {
-	      debug_printf ("aarch64: prologue analysis gave up addr=0x%s"
+	      debug_printf ("aarch64: prologue analysis gave up addr=%s"
 			    " opcode=0x%x\n",
 			    core_addr_to_string_nz (start), insn);
 	    }