tree-wide: convert open calls to remove spaces to skip_spaces() lib function

Makes use of skip_spaces() defined in lib/string.c for removing leading
spaces from strings all over the tree.

It decreases lib.a code size by 47 bytes and reuses the function tree-wide:
   text    data     bss     dec     hex filename
  64688     584     592   65864   10148 (TOTALS-BEFORE)
  64641     584     592   65817   10119 (TOTALS-AFTER)

Also, while at it, if we see (*str && isspace(*str)), we can be sure to
remove the first condition (*str) as the second one (isspace(*str)) also
evaluates to 0 whenever *str == 0, making it redundant. In other words,
"a char equals zero is never a space".

Julia Lawall tried the semantic patch (http://coccinelle.lip6.fr) below,
and found occurrences of this pattern on 3 more files:
    drivers/leds/led-class.c
    drivers/leds/ledtrig-timer.c
    drivers/video/output.c

@@
expression str;
@@

( // ignore skip_spaces cases
while (*str &&  isspace(*str)) { \(str++;\|++str;\) }
|
- *str &&
isspace(*str)
)

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Cc: Julia Lawall <julia@diku.dk>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Neil Brown <neilb@suse.de>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: David Howells <dhowells@redhat.com>
Cc: <linux-ext4@vger.kernel.org>
Cc: Samuel Ortiz <samuel@sortiz.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 4 insertions, 4 deletions

diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
index a482dd7b031..9b3be74cee5 100644
--- a/drivers/video/backlight/lcd.c
+++ b/drivers/video/backlight/lcd.c
@@ -101,7 +101,7 @@ static ssize_t lcd_store_power(struct device *dev,
 	int power = simple_strtoul(buf, &endp, 0);
 	size_t size = endp - buf;
 
-	if (*endp && isspace(*endp))
+	if (isspace(*endp))
 		size++;
 	if (size != count)
 		return -EINVAL;
@@ -140,7 +140,7 @@ static ssize_t lcd_store_contrast(struct device *dev,
 	int contrast = simple_strtoul(buf, &endp, 0);
 	size_t size = endp - buf;
 
-	if (*endp && isspace(*endp))
+	if (isspace(*endp))
 		size++;
 	if (size != count)
 		return -EINVAL;
diff --git a/drivers/video/display/display-sysfs.c b/drivers/video/display/display-sysfs.c
index 4830b1bf51e..80abbf323b9 100644
--- a/drivers/video/display/display-sysfs.c
+++ b/drivers/video/display/display-sysfs.c
@@ -67,7 +67,7 @@ static ssize_t display_store_contrast(struct device *dev,
 	contrast = simple_strtoul(buf, &endp, 0);
 	size = endp - buf;
 
-	if (*endp && isspace(*endp))
+	if (isspace(*endp))
 		size++;
 
 	if (size != count)
diff --git a/drivers/video/output.c b/drivers/video/output.c
index 5e6439ae739..5137aa016b8 100644
--- a/drivers/video/output.c
+++ b/drivers/video/output.c
@@ -50,7 +50,7 @@ static ssize_t video_output_store_state(struct device *dev,
 	int request_state = simple_strtoul(buf,&endp,0);
 	size_t size = endp - buf;
 
-	if (*endp && isspace(*endp))
+	if (isspace(*endp))
 		size++;
 	if (size != count)
 		return -EINVAL;