[MTD] cmdlinepart.c: don't compare pointers with 0

Sparse spotted that 0 was compared to pointers.

While I was at it, I also moved the assignments out of the if's.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

drivers/mtd/cmdlinepart.c

@@ -119,7 +119,8 @@ static struct mtd_partition * newpart(char *s,
 		char *p;
 
 	    	name = ++s;
-		if ((p = strchr(name, delim)) == 0)
+		p = strchr(name, delim);
+		if (!p)
 		{
 			printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
 			return NULL;
@@ -159,9 +160,10 @@ static struct mtd_partition * newpart(char *s,
 			return NULL;
 		}
 		/* more partitions follow, parse them */
-		if ((parts = newpart(s + 1, &s, num_parts,
-		                     this_part + 1, &extra_mem, extra_mem_size)) == 0)
-		  return NULL;
+		parts = newpart(s + 1, &s, num_parts, this_part + 1,
+				&extra_mem, extra_mem_size);
+		if (!parts)
+			return NULL;
 	}
 	else
 	{	/* this is the last partition: allocate space for all */