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bio: on a second thought, make it one line less

--- a/sys/src/libbio/brdstr.c

+++ b/sys/src/libbio/brdstr.c

@@ -3,13 +3,12 @@

 #include	<bio.h>

 static char*

-badd(char *p, int *np, char *data, int ndata, int delim, int nulldelim)

+badd(char *oldp, int *np, char *data, int ndata, int delim, int nulldelim)

 {

 	int n;

-	char *oldp;

+	char *p;

 	n = *np;

-	oldp = p;

 	p = realloc(oldp, n+ndata+1);

 	if(p){

 		memmove(p+n, data, ndata);