Add guards for the malloc calls in SSZipArchive.m file.

SSZipArchive/SSZipArchive.m

@@ -177,6 +177,11 @@
             }
             
             char *filename = (char *)malloc(fileInfo.size_filename + 1);
+            if (filename == NULL)
+            {
+                return NO;
+            }
+            
             unzGetCurrentFileInfo(zip, &fileInfo, filename, fileInfo.size_filename + 1, NULL, 0, NULL, 0);
             filename[fileInfo.size_filename] = '\0';
             
@@ -596,9 +601,13 @@
         }
     }
     
-    zipOpenNewFileInZip3(_zip, afileName, &zipInfo, NULL, 0, NULL, 0, NULL, Z_DEFLATED, Z_DEFAULT_COMPRESSION, 0, -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY, [password UTF8String], 0);
-    
     void *buffer = malloc(CHUNK);
+    if (buffer == NULL)
+    {
+        return NO;
+    }
+
+    zipOpenNewFileInZip3(_zip, afileName, &zipInfo, NULL, 0, NULL, 0, NULL, Z_DEFLATED, Z_DEFAULT_COMPRESSION, 0, -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY, [password UTF8String], 0);
     unsigned int len = 0;
     
     while (!feof(input))