[PATCH tip 1/1] perf_counter tools: Fix off-by-one bug in symbol__new

[Arnaldo Carvalho de Melo <acme@redhat.com>]

The end is really (start + len - 1). Noticed when synthesizing the PLT
symbols, that are small (16 bytes), and hot on the start RIP.
    
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/Documentation/perf_counter/util/symbol.c b/Documentation/perf_counter/util/symbol.c
index d52a1ae..35ee6de 100644
--- a/Documentation/perf_counter/util/symbol.c
+++ b/Documentation/perf_counter/util/symbol.c
@@ -19,7 +19,7 @@ static struct symbol *symbol__new(uint64_t start, uint64_t len,
 			self = ((void *)self) + priv_size;
 		}
 		self->start = start;
-		self->end   = start + len;
+		self->end   = start + len - 1;
 		memcpy(self->name, name, namelen);
 	}