Fixed findings

List of Findings

Error: CPPCHECK_WARNING (CWE-476): [#def1]
gst-plugins-base-1.28.1/gst-libs/gst/tag/gstexiftag.c:1451: warning[nullPointerOutOfMemory]: If memory allocation fails, then there is a possible null pointer dereference: data
# 1449|       /* +1 because it could be a string without the \0 */
# 1450|       data = malloc (alloc_size);
# 1451|->     memcpy (data, info.data + real_offset, count);
# 1452|       data[count] = 0;
# 1453|   

Error: CPPCHECK_WARNING (CWE-476): [#def2]
gst-plugins-base-1.28.1/gst-libs/gst/tag/gstexiftag.c:1452: warning[nullPointerOutOfMemory]: If memory allocation fails, then there is a possible null pointer dereference: data
# 1450|       data = malloc (alloc_size);
# 1451|       memcpy (data, info.data + real_offset, count);
# 1452|->     data[count] = 0;
# 1453|   
# 1454|       gst_buffer_unmap (reader->buffer, &info);

Error: CPPCHECK_WARNING (CWE-476): [#def3]
gst-plugins-base-1.28.1/gst-libs/gst/tag/gstexiftag.c:1457: warning[nullPointerOutOfMemory]: If memory allocation fails, then there is a possible null pointer dereference: data
# 1455|     } else {
# 1456|       data = malloc (count + 1);
# 1457|->     memcpy (data, (guint8 *) offset_as_data, count);
# 1458|       data[count] = 0;
# 1459|     }

Error: CPPCHECK_WARNING (CWE-476): [#def4]
gst-plugins-base-1.28.1/gst-libs/gst/tag/gstexiftag.c:1458: warning[nullPointerOutOfMemory]: If memory allocation fails, then there is a possible null pointer dereference: data
# 1456|       data = malloc (count + 1);
# 1457|       memcpy (data, (guint8 *) offset_as_data, count);
# 1458|->     data[count] = 0;
# 1459|     }
# 1460|   

Error: CPPCHECK_WARNING (CWE-758): [#def5]
gst-plugins-base-1.28.1/gst/typefind/gsttypefindfunctions.c:6810: error[shiftTooManyBits]: Shifting 32-bit value by 49 bits is undefined behaviour
# 6808|     for (i = 0; i < 8; i++) {
# 6809|       leb128_byte = data[i];
# 6810|->     value |= (((gint) leb128_byte & 0x7f) << (i * 7));
# 6811|       if (!(leb128_byte & 0x80))
# 6812|         break;

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