Trivial changes: whitespace and modes.

Remote whitespace at the ends of lines.
Remove blank lines from the ends of files.
Change modes on source files so that they
are not executable.

Signed-off-by: Dan Cross <cross@gajendra.net>

src/cmd/rc/exec.c

@@ -135,7 +135,7 @@ main(int argc, char *argv[])
 	code bootstrap[32];
 	char num[12], *rcmain;
 	int i;
-	
+
 	/* needed for rcmain later */
 	putenv("PLAN9", unsharp("#9"));
 
@@ -690,7 +690,7 @@ word*
 copynwords(word *a, word *tail, int n)
 {
 	word *v, **end;
-	
+
 	v = 0;
 	end = &v;
 	while(n-- > 0){

src/cmd/rc/havefork.c

@@ -37,11 +37,11 @@ Xasync(void)
 		 * ssh foo & will reopen /dev/tty, try to read a password,
 		 * get a signal, and repeat, in a tight loop, forever.
 		 * Arguably this is a bug in ssh (it behaves the same
-		 * way under bash as under rc) but I'm fixing it here 
+		 * way under bash as under rc) but I'm fixing it here
 		 * anyway.  If we dissociate the process from the tty,
 		 * then it won't be able to open /dev/tty ever again.
 		 * The SIG_IGN on SIGTTOU makes writing the tty
-		 * (via fd 1 or 2, for example) succeed even though 
+		 * (via fd 1 or 2, for example) succeed even though
 		 * our pgrp is not the terminal's controlling pgrp.
 		 */
 		if((tty = open("/dev/tty", OREAD)) >= 0){

src/cmd/rc/lex.c

@@ -50,7 +50,7 @@ advance(void)
 }
 /*
  * read a character from the input stream
- */	
+ */
 
 int
 getnext(void)

src/cmd/rc/plan9ish.c

@@ -343,7 +343,7 @@ char **mkenv(){
 	}
 	*ep=0;
 	qsort((char *)env, nvar, sizeof ep[0], cmpenv);
-	return env;	
+	return env;
 }
 void Updenv(void){}
 void Execute(word *args, word *path)
@@ -556,7 +556,7 @@ int
 exitcode(char *msg)
 {
 	int n;
-	
+
 	n = atoi(msg);
 	if(n == 0)
 		n = 1;
@@ -579,7 +579,7 @@ void
 delwaitpid(int pid)
 {
 	int r, w;
-	
+
 	for(r=w=0; r<nwaitpids; r++)
 		if(waitpids[r] != pid)
 			waitpids[w++] = waitpids[r];
@@ -596,7 +596,7 @@ int
 havewaitpid(int pid)
 {
 	int i;
-	
+
 	for(i=0; i<nwaitpids; i++)
 		if(waitpids[i] == pid)
 			return 1;

src/cmd/rc/tree.c

@@ -136,7 +136,7 @@ void
 freetree(tree *p)
 {
 	if(p==0)
-		return;	
+		return;
 	freetree(p->child[0]);
 	freetree(p->child[1]);
 	freetree(p->child[2]);