gdb-rx-tdep: make RXO_branch more robust

[DJ Delorie <dj@redhat.com>]

My next sim patch changes RXO_branch to not have a condition for
unconditional branches (as opposed to the "always true" condition).
Regardless, I think there's no need to check for RX_Operand_Condition
anyway - previously, it was the *only* value that type could be, for
RXO_branch.  I'd change it to check for unconditional, but I don't
want to break things between this patch and the next.  Ok?

	* rx-tdep.c (rx_analyze_prologue): Don't require branches to have
	conditions.

Index: gdb/rx-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/rx-tdep.c,v
retrieving revision 1.3
diff -p -U3 -r1.3 rx-tdep.c
--- gdb/rx-tdep.c	24 Jun 2010 20:38:04 -0000	1.3
+++ gdb/rx-tdep.c	29 Jul 2010 02:25:34 -0000
@@ -296,7 +296,6 @@ rx_analyze_prologue (CORE_ADDR start_pc,
 	}
       else if (opc.id == RXO_branch
 	       && opc.op[0].type == RX_Operand_Immediate
-	       && opc.op[1].type == RX_Operand_Condition
 	       && next_pc < opc.op[0].addend)
 	{
 	  /* When a loop appears as the first statement of a function