Patch: Fix elf_find_function () on a corner case

[Jie Zhang]

I found an issue of ld of latest CVS on the following small case:

$ cat a.c

extern void bar ();

aaa ()
{
   bar ();
}

$ cat b.c

extern void bar ();

bbb ()
{
   bar ();
}

$ cat m.c

int main ()
{
   aaa ();
   bbb ();
   return 0;
}

$ gcc -c a.c b.c m.c
$ ld -r -o t.o a.o b.o
$ ld -o m m.o t.o
ld: warning: cannot find entry symbol _start; defaulting to 08048094
t.o: In function `aaa':b.c:(.text+0x7): undefined reference to `bar'
t.o: In function `bbb':b.c:(.text+0x17): undefined reference to `bar'


While we expect it to output:

ld: warning: cannot find entry symbol _start; defaulting to 08048094
t.o: In function `aaa': undefined reference to `bar'
t.o: In function `bbb': undefined reference to `bar'

I found the automaton in elf_find_function () misses such case. The 
attached patch should fix it on such cases. It's tested using ld 
testsuite and no regressions found.

Is it OK?

Thanks,
Jie
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