[trunk + 7.4] fix erroneous comparison in filter_sals

[Tom Tromey]

I'm checking this in on the trunk and the 7.4 branch.

Debugging ambiguous linespec regressions on PPC showed that this
conditional was partially reversed.

Built and regtested on x86-64 F15 and PPC (gcc110, some version of
Debian -- btw this is a nice 64-way box, very fast builds there).

Tom

2011-12-16  Tom Tromey  <tromey@redhat.com>

	* cli/cli-cmds.c (filter_sals): Filter out sals with NULL symtab.

Index: cli/cli-cmds.c
===================================================================
RCS file: /cvs/src/src/gdb/cli/cli-cmds.c,v
retrieving revision 1.120
diff -u -r1.120 cli-cmds.c
--- cli/cli-cmds.c	6 Dec 2011 18:54:40 -0000	1.120
+++ cli/cli-cmds.c	16 Dec 2011 21:17:08 -0000
@@ -1516,7 +1516,7 @@
   for (i = 0; i < sals->nelts; ++i)
     {
       if (sals->sals[i].pspace == current_program_space
-	  || sals->sals[i].symtab == NULL)
+	  && sals->sals[i].symtab != NULL)
 	{
 	  sals->sals[out] = sals->sals[i];
 	  ++out;