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9boot: replace strrchr() call with a loop and strchr() for ignoring bang path prefixes

--- a/sys/src/boot/pc/sub.c

+++ b/sys/src/boot/pc/sub.c

@@ -66,17 +66,6 @@

 	return 0;

 }

-char*

-strrchr(char *s, int c)

-{

-	char *r = 0;

-

-	while(s = strchr(s, c))

-		r = s++;

-

-	return r;

-}

-

 void

 print(char *s)

 {

@@ -264,7 +253,7 @@

 		print("no bootfile\r\n");

 		goto Loop;

 	}

-	if(p = strrchr(kern, '!'))

+	while(p = strchr(kern, '!'))

 		kern = p+1;

 	return kern;

-- 

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