eina benchmarks: remove dereference of null

Summary:
A static analysis tool detects return value of malloc could be NULL and its
following lines could have derefernece of NULL case.

Reviewers: bu5hm4n, zmike, Hermet

Reviewed By: zmike

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D9812

src/benchmarks/eina/ecore_strings.c

@@ -83,6 +83,7 @@ ecore_string_instance(const char *string)
 
         str =
            (Ecore_String *)malloc(sizeof(Ecore_String) + length * sizeof(char));
+        if (!str) return NULL;
 
         str->string = (char *)(str + 1);
         str->references = 0;

src/benchmarks/eina/evas_mempool.c

@@ -40,6 +40,7 @@ _evas_mp_pool_new(Evas_Mempool *pool)
    item_alloc =
       ((pool->item_size + sizeof(void *) - 1) / sizeof(void *)) * sizeof(void *);
    p = malloc(sizeof(Pool) + (pool->pool_size * item_alloc));
+   if (!p) return NULL;
    ptr = (void **)(((unsigned char *)p) + sizeof(Pool));
    p->usage = 0;
    p->base = ptr;