Fix a bad merge:

Remove a cast (which shouldn't have got here anyway)
which might lose significant bits beyond 4 GB RAM.


mysys/safemalloc.c:
  Vlad's comment to the cast:
    pointless cast from size_t to uint that loses
    significant bits, when safe_malloc allocates more than 4GB Ram.
    safemalloc is not used in release binaries,
    so it is not absolutely critical.
  
  It got into the sources by a wrong merge resolution.

mysys/safemalloc.c

@@ -174,7 +174,7 @@ void *_mymalloc(size_t size, const char *filename, uint lineno, myf MyFlags)
   data[size + 3]= MAGICEND3;
   irem->filename= (char *) filename;
   irem->linenum= lineno;
-  irem->datasize= (uint32) size;
+  irem->datasize= size;
   irem->prev=	  NULL;
 
   /* Add this remember structure to the linked list */