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jukefs: fix realloc sizes (thanks mischief)

--- a/sys/src/games/music/jukefs/parse.c

+++ b/sys/src/games/music/jukefs/parse.c

@@ -436,7 +436,7 @@

 		 */

 		for(i = 0; i < parent->nchildren; i++)

 				if(parent->children[i] == child) return;

-		parent->children = realloc(parent->children, (i+1)*4);

+		parent->children = realloc(parent->children, (i+1)*sizeof(Object*));

 		parent->children[i] = child;

 		parent->nchildren++;

 		if(parent->type == Category && child->type == Category)

@@ -457,7 +457,7 @@

 		i = child->ncatparents;

 		if(0) fprint(2, "addcatparent %s parent %d type %d child %d type %d\n",where,

 			parent->tabno, parent->type, child->tabno, child->type);

-		child->catparents = realloc(child->catparents, (i+1)*4);

+		child->catparents = realloc(child->catparents, (i+1)*sizeof(Object*));

 		child->catparents[i] = parent;

 		child->ncatparents++;

 }

@@ -476,7 +476,7 @@

 //				if(child->catparents[i] == parent) return;

 		i = child->ncatparents;

 		fprint(2, "addcatparent parent %d child %d\n", parent->tabno, child->tabno);

-		child->catparents = realloc(child->catparents, (i+1)*4);

+		child->catparents = realloc(child->catparents, (i+1)*sizeof(Object*));

 		child->catparents[i] = parent;

 		child->ncatparents++;

 }