perf bench mem: Rename 'routine' to 'routine_str'

So bench/mem-functions.c has a 'routine' name for the routines parameter
string, but a 'length_str' name for the length parameter string.

We also have another entity named 'routine': 'struct routine'.

This is inconsistent and confusing: rename 'routine' to 'routine_str'.

Also fix typos in the --routine help text.
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1445241870-24854-9-git-send-email-mingo@kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/bench/mem-functions.c

@@ -24,7 +24,7 @@
 #define K 1024
 
 static const char	*length_str	= "1MB";
-static const char	*routine	= "all";
+static const char	*routine_str	= "all";
 static int		iterations	= 1;
 static bool		use_cycles;
 static int		cycles_fd;
@@ -33,8 +33,8 @@ static const struct option options[] = {
 	OPT_STRING('l', "length", &length_str, "1MB",
 		    "Specify length of memory to copy. "
 		    "Available units: B, KB, MB, GB and TB (upper and lower)"),
-	OPT_STRING('r', "routine", &routine, "all",
-		    "Specify routine to copy, \"all\" runs all available routines"),
+	OPT_STRING('r', "routine", &routine_str, "all",
+		    "Specify the routine to run, \"all\" runs all available routines"),
 	OPT_INTEGER('i', "iterations", &iterations,
 		    "repeat memcpy() invocation this number of times"),
 	OPT_BOOLEAN('c', "cycles", &use_cycles,
@@ -181,18 +181,18 @@ static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *
 		return 1;
 	}
 
-	if (!strncmp(routine, "all", 3)) {
+	if (!strncmp(routine_str, "all", 3)) {
 		for (i = 0; info->routines[i].name; i++)
 			__bench_mem_routine(info, i, len, totallen);
 		return 0;
 	}
 
 	for (i = 0; info->routines[i].name; i++) {
-		if (!strcmp(info->routines[i].name, routine))
+		if (!strcmp(info->routines[i].name, routine_str))
 			break;
 	}
 	if (!info->routines[i].name) {
-		printf("Unknown routine:%s\n", routine);
+		printf("Unknown routine: %s\n", routine_str);
 		printf("Available routines...\n");
 		for (i = 0; info->routines[i].name; i++) {
 			printf("\t%s ... %s\n",