Fix a memory corruption runtime error

On the msvc build, the tests t0401-parse and t0501-walk both
crash with a runtime error (ACCESS_VIOLATION). This is caused
by writing to un-allocated memory due to an under-allocation
of a git_revpool_table data structure.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Andreas Ericsson <ae@op5.se>

src/revobject.c

@@ -38,7 +38,7 @@ git_revpool_table *git_revpool_table_create(unsigned int min_size)
 	git_revpool_table *table;
 	int i;
 
-	table = git__malloc(sizeof(table));
+	table = git__malloc(sizeof(*table));
 
 	if (table == NULL)
 		return NULL;