eet: add check for realloc fail.

Summary:
Thought, if realloc fails, its better to fail the test case than
continue.

Signed-off-by: Srivardhan Hebbar <sri.hebbar@samsung.com>

Reviewers: cedric

Differential Revision: https://phab.enlightenment.org/D3273

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>

src/tests/eet/eet_suite.c

@@ -828,6 +828,8 @@ append_string(void       *data,
    length = *string ? strlen(*string) : 0;
    *string = realloc(*string, strlen(str) + length + 1);
 
+   fail_unless(*string); // Fail test case if realloc fails.
+
    memcpy((*string) + length, str, strlen(str) + 1);
 } /* append_string */