Fix memory leaks (#1511)

src/lib_ccx/dvb_subtitle_decoder.c

@@ -1600,7 +1600,9 @@ static int write_dvb_sub(struct lib_cc_decode *dec_ctx, struct cc_subtitle *sub)
 				break;
 		}
 
-		rect->data1 = malloc(1024);
+		if (rect->data1 == NULL) {
+		    rect->data1 = malloc(1024);
+		}
 		memset(rect->data1, 0, 1024);
 		memcpy(rect->data1, clut_table, (1 << region->depth) * sizeof(uint32_t));
 		assert(((1 << region->depth) * sizeof(uint32_t)) <= 1024);

src/lib_ccx/ocr.c

@@ -672,14 +672,14 @@ char *ocr_bitmap(void *arg, png_color *palette, png_byte *alpha, unsigned char *
 					line_start = line_end + 1;
 				}
 				*new_text_out_iter = '\0';
-				free(text_out);
+				freep(&text_out);
 				text_out = new_text_out;
 			}
 		}
 		TessResultIteratorDelete(ri);
 	}
 	// End Color Detection
-
+	freep(&text_out);
 	boxDestroy(&crop_points);
 
 	pixDestroy(&pix);