parser: remove unnecessary strlen()

No functional change.  Cache strlen() result to avoid recalculating it up
to 3 times on the worst case.

Reduces code size a little by 32 bytes:
   text    data     bss     dec     hex filename
   1385       0       0    1385     569 lib/parser.o-BEFORE
   1353       0       0    1353     549 lib/parser.o-AFTER

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 4 deletions

diff --git a/lib/parser.c b/lib/parser.c
index b00d02059a5f..fb34977246bb 100644
--- a/lib/parser.c
+++ b/lib/parser.c
@@ -56,13 +56,16 @@ static int match_one(char *s, const char *p, substring_t args[])
 
                 args[argc].from = s;
                 switch (*p++) {
-                case 's':
-                        if (strlen(s) == 0)
+                case 's': {
+                        size_t str_len = strlen(s);
+
+                        if (str_len == 0)
                                 return 0;
-                        else if (len == -1 || len > strlen(s))
-                                len = strlen(s);
+                        if (len == -1 || len > str_len)
+                                len = str_len;
                         args[argc].to = s + len;
                         break;
+                }
                 case 'd':
                         simple_strtol(s, &args[argc].to, 0);
                         goto num;