perf annotate: Allocate history size correctly

Symbol offset history table size does not get updated properly
when it is being resized. This leads to garbage results in
perf annotate.
Signed-off-by: NNick Piggin <npiggin@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <new-submission>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

tools/perf/util/symbol.c

@@ -227,6 +227,10 @@ static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int v)
 			      *curr = rb_entry(nd, struct symbol, rb_node);
 
 		prev->end = curr->start - 1;
+		if (prev->hist) {
+			free(prev->hist);
+			prev->hist = calloc(sizeof(u64), prev->end - prev->start);
+		}
 		prevnd = nd;
 	}
 
@@ -883,6 +887,10 @@ static inline void dso__fill_symbol_holes(struct dso *self)
 					pos->end = prev->end;
 				else if (hole)
 					pos->end = prev->start - 1;
+				if (pos->hist) {
+					free(pos->hist);
+					pos->hist = calloc(sizeof(u64), pos->end - pos->start);
+				}
 			}
 		}
 		prev = pos;