Setting a variable to the same value twice doesn't actually make it

more likely to have the right value.  Remove superfluous assignments.

Found by:	LLVM/Clang Static Checker

sys/boot/common/misc.c

@@ -42,7 +42,7 @@ unargv(int argc, char *argv[])
     int		i;
     char	*cp;
 
-    for (hlong = 0, i = 0, hlong = 0; i < argc; i++)
+    for (i = 0, hlong = 0; i < argc; i++)
 	hlong += strlen(argv[i]) + 2;
 
     if(hlong == 0)

usr.bin/rs/rs.c

@@ -153,7 +153,6 @@ getfile(void)
 				p++;
 		}
 	ep = getptrs(elem);
-	p = curline;
 	do {
 		if (flags & ONEPERLINE) {
 			*ep = curline;

usr.bin/yacc/closure.c

@@ -142,7 +142,6 @@ set_first_derives()
 	    }
 	}
 
-	vrow += varsetsize;
 	rrow += rulesetsize;
     }
 
@@ -173,7 +172,6 @@ int n;
     int itemno;
 
     rulesetsize = WORDSIZE(nrules);
-    rsp = ruleset;
     rsend = ruleset + rulesetsize;
     for (rsp = ruleset; rsp < rsend; rsp++)
 	*rsp = 0;